It looked like a commercial eye tracker to me, so we wouldn't be able to open source it. However, a quick Google search revealed some things that might be promising.

Eye tracker hardware is tricky and therefore usually expensive, but on the software side there are good tools. I've used VisionEgg[0] with an Eyelink II system and found it quite easy to deal with.

[0] http://www.visionegg.org/

Not that expensive. For a couple of hundred dollars you can build very nice 60-90fps IR eye tracking system. You'll need IR camera, IR tele lens (very important), couple of IR sources and open source tracking software. See http://www.gazegroup.org/develop/

There is also alternative approach. If you are just recording and don't need interactivity - all you need, is a regular camera with zoom and a small tripod. You can record on an SD card and synchronize the stream stream time in post-processing. Just flash the monitor screen couple of times at the start and the end of the recording, and play tracking alignment sequence.

Here's an attempt to do just that: http://www.youtube.com/watch?v=zJqKRL9D2qY

I somehow assumed this was done with a webcam eyetracking software .. my bad.

I forgot to add, I would also be interested in seeing this for photographs and paintings!

Do you mean the videos themselves, the software, or the hardware?