var vScale = 16;

​

function setup() {

  createCanvas(640, 480);

  pixelDensity(1);

  video = createCapture(VIDEO);

  video.size(width/vScale,height/vScale);

}

​

function draw() {

  background(51);

  video.loadPixels();

  loadPixels();

  for (var y = 0 ; y < video.height; y ++) {

    for (var x = 0 ; x < video.width; x ++) {

      var index = ( x + y * video.width)*4;

      var r = video.pixels[index+0];

      var g = video.pixels[index+1];

      var b = video.pixels[index+2];

      var bright = (r+g+b)/3;

      fill(bright);

      rect(x*vScale,y*vScale,vScale,vScale);

    }

  }

}