import processing.video.*;

Movie mov;
void setup()
{
  size(640, 360);
  noStroke();
  mov = new Movie(this, "sample.mp4");
  mov.loop();
  mov.play();
}

void draw()
{
  if ( mov.available() == true ) {
    background(0); 
    mov.read();
    mov.loadPixels();
    for ( int i = 0; i < mov.height; i=i+20 ) {
      for ( int j = 0; j < mov.width; j=j+20 ) {
        color c1 = mov.get(j, i);
        float gray = (red(c1)+green(c1)+blue(c1))/3.0;
        gray = map(gray, 0,255, 0, 28);
        fill(255);
        ellipse(j, i, gray, gray);
      }
    }
  }
}