So I just tried facetracknoir...how do I make it not soo sensitive and snap like in the video?
1st attempted it didn't center lol
2nd its center but constantly moving.
If you have issues with it could also be the lighting conditions in your room. I had to turn on two lights to get it working really well. You may also be able to do something with your webcam's settings. Here are my settings, you can give them a try if you want: http://i.imgur.com/SDKVXEF.png
If a TrackIR is too expensive for you but you're not averse to spending some money I can definitely recommend the EDTracker. It's pretty easy to build yourself (there's a kit with all the parts floating around) and it works really well.
I actually have a TrackIR but I don't want to wear a head while playing and the side-mount thing for headsets is ridiculously expensive (as is the TrackIR if you ask me).