HDRP Fullscreen Blit with Command Buffer

HdrpFullscreenBlit.cs

using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.HighDefinition;

public class HdrpFullscreenBlit : MonoBehaviour
{
    public Texture Source;

    void OnEnable()
    {
        var cameraData = GetComponent<HDAdditionalCameraData>();
        cameraData.customRender += BlitPass;
    }

    void OnDisable()
    {
        var cameraData = GetComponent<HDAdditionalCameraData>();
        cameraData.customRender -= BlitPass;
    }

    void BlitPass(ScriptableRenderContext context, HDCamera hdCamera)
    {
        var cameraTarget = hdCamera.camera.targetTexture;
        var command = CommandBufferPool.Get();
        command.Blit(Source, cameraTarget);
        context.ExecuteCommandBuffer(command);
        command.Release();
    }
}