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Head tracking may work well, depending on ability to control head/neck. There are several methods (mostly originating in the flight sim community).

1. Face tracking (very easy to try, FaceTrackNoIR or Opentrack)
2. Head tracking with IR clip (bit more reliable than face, many DIY guides out there)
3. Head tracking with Aruco marker (available in Opentrack)

I use freetrack for flightsims and racing games etc, it's free headtracking software and can be found here: http://www.free-track.net/english/ . I put my setup together for around £30 including the PS3 etyetoy I use as the camera and the soldering iron as well! Slight modification for a webcam is needed to remove the IR filter, but it is quite straightforward as per this video http://www.youtube.com/watch?v=7jJfuP7YgPA. In conjunction with GlovePIE you can program your head movements in freetrack to any controls you desire https://sites.google.com/site/carlkenner/glovepie (normally I'd say glovePIE.org, but it seems to have been 'hacked' by a moron for the time being). It can be used with almost any external controller, but it works very well with Freetrack. For instance in an FPS you could use your head to control WASD (lean forward for W, lean back for S, lean left for A, and lean right for D ) while your able hand controls the mouse. You could however use whatever variation suits you for any particular style of game. Hope that helps.

I use freetrack for headtracking in flightsims, racing games and Arma II, it's a free version of TrackIR (overpriced and aggressive about its dubious IP so I avoid) look here: http://www.free-track.net/english/. It is quite simple to build a headset with some IR LEDs and almost any camera will work with it. I built my set-up for around £30 including the soldering iron and a second hand PS3 eyetoy modded as per these instructions http://www.youtube.com/watch?v=7jJfuP7YgPA. In conjunction with Glovepie, software which will allow you to program controls via almost any external controller https://sites.google.com/site/carlkenner/glovepie. You would be able to program custom controls for any game of your choosing. For example in an FPS you would be able to use head movement to control WASD keys ( Lean forward for W, lean back for S, lean left for A, lean right for D) and your able hand for the mouse. Here is the link for Glovepie https://sites.google.com/site/carlkenner/glovepie. I would normally give you glovePIE.org, but some retarded script kiddie seems to have 'hacked' it at the moment. Happy gaming...

TrackIR has existed for some years and there is also a free clone of it with FreeTrack.

Make a really simple headgear doo dad that tracks head movement. Use in race car games/flight sims to simulate looking left and right. The tie in to a game might be really exciting. http://www.free-track.net/english/

There's even an open source work-a-like: http://www.free-track.net/english/

like http://www.free-track.net/ ?

Imagine pairing this with a http://www.naturalpoint.com/trackir/TrackIR or http://www.free-track.net/similar system. With a larger FOV you could turn down the sensitivity (which makes it so you don't have to turn your head away from the monitor to see "behind" you) on the tracking system and provide a more lifelike and immersive experience. You still wouldn't have 1:1, but you could tone it down to maybe 1:2.5 or less.

Just take a look at http://free-track.net./

This little software feeds the TrackIR interface from a cheap webcam. Since it doesn't use a Wii it won't make you more attractive to the gender that you prefer being attractive to, but then you get full six degrees of freedom, which a Wii sensor bar can't do (it has only two points to track). Only trouble is the weak framerate most webcams have, and horrible webcam drivers that can suck away a considerable amount of CPU time.