How to Post Process a WebCamTexture in realtime.

This is working on my Windows laptop without any trouble. I haven't tried putting it on iOS yet.

 public class Script : MonoBehavior {
     WebCamTexture webcam;
     Texture2D     output;
     Color32[]     data;

     IEnumerator Start() {
         yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);
         if (Application.HasUserAuthorization(UserAuthorization.WebCam)) {
             webcam = new WebCamTexture();
             webcam.Play();
             output = new Texture2D(webcam.width, webcam.height);
             GetComponent<Renderer>().material.mainTexture = output;
             data = new Color32[webcam.width * webcam.height];
         }
     }

     void Update()  {
         if (data != null) {
             webcam.GetPixels32(data);

             // You can play around with data however you want here.
             // Color32 has member variables of a, r, g, and b. You can read and write them however you want.

             output.SetPixels32(data);
             output.Apply();
         }
     }
 } 

Works perfectly for me. Comments are encouraging too :) Thank you @ArtOfWarfare

Can we add a delay? like 800ms or a variable delay and show output after that delay ... @ArtOfWarfare

If anyone is still searching for this issue. I was able to solve this. Enable URP. Make a shader graph. Make a material from the shader. Apply the material to the Raw image and render webcam texture on the raw image. Any changes you make to the shader are directly reflected in the raw image with almost no loss in performance.