If you're working on this assignment and you can't find the ImageFX script that's mentioned around 4:45, you can do the following:
Alternatively, you can simply paste the following into a new script:
using System.Collections; using System.Collections.Generic; using UnityEngine; public class ImageFX : MonoBehaviour { public Material mat; void OnRenderImage(RenderTexture source, RenderTexture destination) { Graphics.Blit (source, destination, mat); } }