let offset = 0.0;

let captureWidth = 640;

let captureHeight = 480;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  capture = createCapture(VIDEO);

  capture.size(captureWidth, captureHeight);

  capture.hide();

  noStroke();

}

​

function draw() {

  let r = 255 * noise(offset+0);

  let g = 255 * noise(offset+5);

  let b = 255 * noise(offset+10);

  background(255);  

  //fill(r, g, b);

​

  capture.loadPixels();

  const stepSize = round(constrain(mouseX / 8, 6, 32));

  for (let y = 0; y < captureHeight; y += stepSize) {

    for (let x = 0; x < captureWidth; x += stepSize) {

      const i = y * captureWidth + x;

      const darkness = (255 - capture.pixels[i * 4]) / 255;

      const radius = stepSize * darkness;

      ellipse(x, y, radius, radius * map(noise(offset), 0, 1, 0, 15), 0, 1, 0, 2);

    }

  }

  offset += 0.01;

}