var w = 640;

var h = 480;

​

function setup() {

    capture = createCapture(VIDEO);

    createCanvas(w, h);

    capture.size(w, h);

    capture.hide();

}

​

function draw() {

    image(capture, 0, 0, w, h);

    filter(THRESHOLD);

    // filter(INVERT);                  // https://p5js.org/reference/#/p5/filter

    capture.loadPixels();

    if (capture.pixels.length > 0) { // don't forget this! 

    }

}