Put this Monobehaviour on your Camera, it will take the `Custom/Plot.shader` file and render it over the screen -- https://gist.github.com/chuckbergeron/a9518c103a93318ffb092c2f4aa87133

BookOfShadersBlit.cs

using System.Collections;
using UnityEngine;

public class BookOfShadersBlit : MonoBehaviour {

    private Material _material;

    private void Awake()
    {
        _material = new Material(Shader.Find("Custom/PlotShader"));
    }

    private void OnRenderImage(RenderTexture source, RenderTexture destination)
    {
        Graphics.Blit(source, destination, _material);
    }

}