Cleaned up and commented version.

Assets/_Scripts/Eye-Tracking/Not in use test purpose only/GazeDirection.cs

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+using UnityEngine;
+
+public class GazeDirection : MonoBehaviour
+{
+    [Header("Head and Eye-Transforms")]
+    public Transform headcam;
+    public Transform eyeLeft;
+    public Transform eyeRight;
+
+    [Header("Renderer Feature")]
+    public GazeOverlayRendererFeature overlayRendererFeature;
+
+    GazeOverlayRendererFeature.GazeRenderPass pass;
+
+    private void Awake()
+    {
+        pass = overlayRendererFeature.GetPass();
+    }
+
+    private void LateUpdate()
+    {
+        pass.gazeOrigin = (eyeLeft.position + eyeRight.position) * 0.5f; // Mittelpunkt zwischen den Augen
+        pass.gazeDirection = ((eyeLeft.forward + eyeRight.forward) * 0.5f).normalized; // Errechnete mittlere Blickrichtung
+    }
+}

Assets/_Scripts/Eye-Tracking/Not in use test purpose only/GazeDirection.cs.meta

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Assets/_Scripts/Eye-Tracking/Not in use test purpose only/GazeOverlayRendererFeature.cs

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+using UnityEngine;
+using UnityEngine.Rendering;
+using UnityEngine.Rendering.Universal;
+using UnityEngine.Rendering.RenderGraphModule;
+
+// Render Feature, das den Sichtkegel mit fovealem und peripherem Bereich darstellt und pro Kamera aktiviert werden kann.
+public class GazeOverlayRendererFeature : ScriptableRendererFeature
+{
+    public sealed class GazeRenderPass : ScriptableRenderPass
+    {
+        internal Vector3 gazeOrigin;
+        internal Vector3 gazeDirection;
+        internal float foveaHalfRad = Mathf.Deg2Rad * 2.5f; // für 5° fovealer Bereich
+        internal float periHalfRad = Mathf.Deg2Rad * 10f; // für 20° peripheren Bereich
+
+        static readonly int gazeOriginID = Shader.PropertyToID("_GazeOrigin");
+        static readonly int gazeDirectionID = Shader.PropertyToID("_GazeDirection");
+        static readonly int foveaHalfRadID = Shader.PropertyToID("_FoveaAngle");
+        static readonly int periHalfRadID = Shader.PropertyToID("_PeriAngle");
+
+        readonly Material gazeMaterial;
+
+        public GazeRenderPass(Material material) => gazeMaterial = material;
+
+        public override void RecordRenderGraph(RenderGraph renderGraph, ContextContainer frameData)
+        {
+            Debug.Log("RecordRenderGraph");
+            var resourceData = frameData.Get<UniversalResourceData>();
+            TextureHandle depth = resourceData.activeDepthTexture;
+            TextureHandle color = resourceData.activeColorTexture;
+
+            using var builder = renderGraph.AddRasterRenderPass<PassData>("GazeOverlay", out var passData);
+
+            passData.depth = depth;
+            passData.color = color;
+            passData.gazeMaterial = gazeMaterial;
+            passData.gazeOrigin = gazeOrigin;
+            passData.gazeDirection = gazeDirection;
+            passData.foveaHalfRad = foveaHalfRad;
+            passData.periHalfRad = periHalfRad;
+
+            builder.UseTexture(depth, AccessFlags.Read);
+            builder.UseTexture(color, AccessFlags.ReadWrite);
+            builder.SetRenderAttachment(color, 0);
+
+            builder.SetRenderFunc((PassData data, RasterGraphContext ctx) =>
+            {
+                ctx.cmd.ClearRenderTarget(RTClearFlags.Color, new Color(1, 0, 1, 1), 1.0f, 0);
+                //ctx.cmd.SetGlobalVector(gazeOriginID, data.gazeOrigin);
+                //ctx.cmd.SetGlobalVector(gazeDirectionID, data.gazeDirection);
+                //ctx.cmd.SetGlobalFloat(foveaHalfRadID, data.foveaHalfRad);
+                //ctx.cmd.SetGlobalFloat(periHalfRadID, data.periHalfRad);
+
+                //Blitter.BlitTexture(ctx.cmd, data.depth, new Vector4(1, 1, 0, 0),
+                    //data.gazeMaterial, 0);
+            });
+        }
+
+        class PassData
+        {
+            internal TextureHandle depth;
+            internal TextureHandle color;
+            internal Material gazeMaterial;
+            internal Vector3 gazeOrigin, gazeDirection;
+            internal float foveaHalfRad, periHalfRad;
+        }
+    }
+
+    [SerializeField] Material gazeOverlayMaterial;
+    GazeRenderPass pass;
+
+    public GazeRenderPass GetPass() {  return pass; }
+
+    public override void Create()
+    {
+        pass = new GazeRenderPass(gazeOverlayMaterial);
+        Debug.Log("Feature created");
+    }
+
+    public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
+    {
+        renderer.EnqueuePass(pass);
+    }
+}

Assets/_Scripts/Eye-Tracking/Not in use test purpose only/GazeOverlayRendererFeature.cs.meta

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Assets/_Scripts/Eye-Tracking/Not in use test purpose only/_Shaders.meta

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Assets/_Scripts/Eye-Tracking/Not in use test purpose only/_Shaders/GazeOverlay.shader

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+Shader "Hidden/GazeOverlay"
+{
+	SubShader
+	{
+		Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline" }
+		pass
+		{
+			Name "GazeOverlayPass"
+			ZTest Always
+			ZWrite  Off
+			Blend SrcAlpha OneMinusSrcAlpha
+
+			HLSLPROGRAM
+			#pragma vertex VertFullScreenTriangle
+			#pragma fragment frag
+
+
+			#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+
+			struct Varyings
+			{
+				float4 positionHCS : SV_POSITION;
+				float2 texcoord : TEXCOORD0;
+			};
+
+			Varyings VertFullScreenTriangle (uint vertexID : SV_VERTEXID)
+			{
+				Varyings o;
+				o.positionHCS = GetFullScreenTriangleVertexPosition(vertexID);
+				o.texcoord = GetFullScreenTriangleTexCoord(vertexID);
+				return o;
+			}
+
+			#include "GazeOverlayPass.hlsl"
+
+			ENDHLSL
+		}
+	}
+	FallBack Off
+}

Assets/_Scripts/Eye-Tracking/Not in use test purpose only/_Shaders/GazeOverlay.shader.meta

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+  nonModifiableTextures: []
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Assets/_Scripts/Eye-Tracking/Not in use test purpose only/_Shaders/GazeOverlayPass.hlsl

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+#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+
+TEXTURE2D_X(_CameraDepthTexture);
+SAMPLER(sampler_CameraDepthTexture);
+
+float3 _GazeOrigin;
+float3 _GazeDirection;
+float _FoveaAngle;
+float _PeriAngle;
+
+float4 _FoveaColor = float4(0,1,0,0.25);
+float4 _periColor = float4(1,0,0,0.18);
+float4 _BlockedCol = float4(0.3,0.3,0.3,0.22);
+
+half4 frag (Varyings input) : SV_Target
+{
+	return float4(1, 0, 1, 0.5);
+	// Nimmt die Depth Texture und rekonstruiert daraus die World Position
+	//float depth = SAMPLE_TEXTURE2D_X(_CameraDepthTexture, sampler_CameraDepthTexture, input.texcoord).r;
+	//float4 clip = float4(input.texcoord * 2 - 1, depth, 1);
+	//float4 view = mul(UNITY_MATRIX_I_P, clip); view /= view.w;
+	//float3 world = mul(UNITY_MATRIX_I_V, view).xyz;
+
+	// Eryeugt einen Vektor vom Origin zum gewünschten Pixel
+	//float3 v = normalize(world - _GazeOrigin);
+	//float cosAng = dot(v, normalize(_GazeOrigin));
+
+	// Berechnung Cosinus
+	//float cosF = cos(_FoveaAngle);
+	//float cosP = cos(_PeriAngle);
+
+	//float4 col;
+	//if (cosAng >= cosF) col = _FoveaColor;
+	//else if (cosAng >= cosP) col = _periColor;
+	//else discard;
+
+	//uint gLayer = 8;
+	//if (unity_RenderingLayer.x & (1u << gLayer))
+		//col = _BlockedCol;
+
+	//return col;
+}

Assets/_Scripts/Eye-Tracking/Not in use test purpose only/_Shaders/GazeOverlayPass.hlsl.meta

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