Excellent use of eye tracking for the trailer of Outcast

http://www.engadget.com/2016/06/06/outcast-interactive-trailer/?ncid=txtlnkusaolp00000589


The trailer requires use of headphones and a webcam. With your permission, it uses your webcam to detect whether your eyes are closed or open. With your eyes closed, you hear narration, creepy noises and the like; with your eyes open, you'll see flashes of visions mostly pulled from the regular trailer and first episode. It essentially forces you to keep your eyes closed in order to progress....




excellent :)