let g;

let w, h;

​

​

function setup() {

  createCanvas(320, 240);

  pixelDensity(1);

  h = height;

  w = width;

  cam = createCapture(VIDEO);

  cam.size(w, h);

  cam.hide();

  g = createImage(w, h);

  g.loadPixels();

}

​

function draw() {

  background(0);

  cam.loadPixels();

  for (let i = 0; i < pixels.length; i += 4) {

    g.pixels[i + 0] = 0;

    g.pixels[i + 1] = 255;

    g.pixels[i + 2] = 0;

    g.pixels[i + 3] = pixels[i + 1];

  }

  g.updatePixels();

  image(g, 0, 0, w, h);

}

​