I'm attempting to modify this code so that instead of filtering the picture it with filter a live webcam feed.  Any suggestions will help. Thanks!

PImage myPic;

void setup(){
  size(640,480);
  myPic = loadImage("Photo 1.jpg");

  noStroke();
  smooth();
}

int cellSize = 100;

void draw(){
  for(int y=0; y <= width; y+=cellSize){
    for(int x=0; x <= height; x+=cellSize){
     
      color myColor = myPic.get(x,y);      
      fill(myColor);                        
      rect(x,y,cellSize,cellSize);
    }
  }
  noLoop();
}