a photographer set up a RED camera (a high end HD video camera) behind a glass which he projected video games, or music videos on and got a first person look at the engagement it had on the player / viewer.  he took stills from the video.. check them out here

http://www.nytimes.com/slideshow/2008/11/18/magazine/20081123-games_2.html

and the video here

http://video.nytimes.com/video/2008/11/21/magazine/1194833565213/immersion.html

That's great leaf!  thanks for posting