videoPaint

import processing.video.*;
Movie movie;

void setup() {
  size(1280, 720);
  background(0);
  movie = new Movie(this, "beyonce.mp4");
  movie.play();
}

void movieEvent(Movie movie) {
  movie.read();
}

void draw() {
  if (frameCount>5) {
    paint();
  }
}

void paint() {
  if (mousePressed) {
    int sz = (int) random(25, 100);
    PImage tmp = movie.get(mouseX, mouseY, sz, sz);
    tint(255, 100);
    image(tmp, mouseX, mouseY);
  }
  // resized actual video with white dot representing the mouse position
  copy(movie, 0, 0, width, height, 0, 0, width/5, height/5);
  fill(255);
  stroke(0);
  float px = map(mouseX, 0, width, 0, width/6);
  float py = map(mouseY, 0, height, 0, height/6);
  ellipse(px, py, 5, 5);
}

void keyPressed() {
  saveFrame("image-###.png");
}