videoStuff

import processing.video.*;

Movie movie;

void setup() {
  size(1280,720);
  background(150);
  movie = new Movie(this, "beyonce.mp4");
  movie.play();
}

void draw() {
  if (movie.available()) {
    movie.read();
    image(makeTooBrightColorTransparent(movie, 100), 0, 0);
  }
}

// answer to my question on forum.Processing.org/two/discussion/21653/how-to-make-a-pixel-transparent
// GoToLoop (2017-Mar-28)

PImage makeTooBrightColorTransparent( PImage img, int bright) {
  img.loadPixels();
  color colors[] = img.pixels, len = colors.length;
  for (int i = 0; i < len; ++i) {
    color c = colors[i];
    if (brightness(c) > bright) {
      colors[i] = c & ~PImage.ALPHA_MASK;
    }
  }
  img.updatePixels();
  return img;
}

void mouseReleased() {
  save(random(9999)+".png");
}