let xScale;

let yScale;

function setup() {

  createCanvas(600, 600);

  cam = createCapture(VIDEO);

  cam.size(600,600);

  cam.hide();

  xScale = width/cam.width;

  yScale = height/cam.height;

}

​

function draw() {

  background(220);

   cam.loadPixels();

  for(let y = 0; y < cam.height; y++){

    for(let x = 0; x< cam.width; x++) {

      let i = (x + y * cam.width) *4;

      let r = cam.pixels[i+0];

      let g = cam.pixels[i+1];

      let b = cam.pixels[i+2];

      noStroke();

      fill(r,g,b);

      rect(x*xScale,y*yScale,xScale,yScale);

    }

  }

  cam.updatePixels();

}