function preload(){
  video = createVideo('data/ball.mov');
}
Use a video to check on/off a grid of checkboxes
Shout out to Dan Shiffman's checkbox mirror example


SLIDER
drag                : drag the slider to adjust the image threshold

CONTRIBUTED BY
[Joey Lee](http://jk-lee.com)

INSPIRED BY
[Dan Shiffman](http://shiffman.net/)