CameraCapturer

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEngine.Rendering;

public static class CameraCapturer
{
    [MenuItem("Test/CaptureCamera")]
    private static void CaptureCamera()
    {
        RenderPipelineAsset urpAsset = GraphicsSettings.renderPipelineAsset;
        GraphicsSettings.renderPipelineAsset = null;
        Camera camera = CreateCamera();
        camera.targetTexture = CreateRenderTexture(512, 512);
        ClearRenderTexture(camera.targetTexture);
        
        var replaceShader = Shader.Find("Unlit/Replace");
        camera.RenderWithShader(replaceShader, "RenderType");
        SaveRenderTextureToAssset(camera.targetTexture, "Assets/Textures/result.png");

        //release
        camera.targetTexture.Release();
        GameObject.DestroyImmediate(camera.gameObject);
        GraphicsSettings.renderPipelineAsset = urpAsset;
    }

    private static Camera CreateCamera()
    {
        var camera = Camera.Instantiate(Camera.main);
        camera.clearFlags = CameraClearFlags.Nothing;
        camera.backgroundColor = Color.black;
        camera.enabled = false;
        return camera;
    }

    private static void ClearRenderTexture(RenderTexture renderTexture)
    {
        RenderTexture.active = renderTexture;
        GL.Clear(true, true, Color.black, 1f);
        RenderTexture.active = null;
    }

    private static void SaveRenderTextureToAssset(RenderTexture renderTexture, string assetPath)
    {
        string fullPath = assetPath.Replace("Assset", Application.dataPath);
        Texture2D tex = new Texture2D(renderTexture.width, renderTexture.height, TextureFormat.ARGB32, false, false);
        RenderTexture.active = renderTexture;
        tex.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0, false);
        tex.Apply();
        RenderTexture.active = null;
        var bytes = tex.EncodeToPNG();
        System.IO.File.WriteAllBytes(fullPath, bytes);
        AssetDatabase.ImportAsset(assetPath); 
    }

    private static RenderTexture CreateRenderTexture(int width, int height)
    {
        RenderTexture rtex = new RenderTexture(width, height, 24, RenderTextureFormat.ARGB32);
        return rtex;
    }

}