Hi,
Its not head tracking but it uses Wii controllers to do things audio visually.
WiiWhorld :
Whorld is a free, open-source, live visual synthesizer for sacred geometry. It uses math to create a seamless animation of mesmerizing psychedelic images. You can VJ with it, make unique digital artwork with it, or sit back and watch it like a screensaver. The WiiWhorld project makes it possible to control the Whorld visualizer with the Nintendo Wiimote.
http://createdigitalmotion.com/2008/04/11/wiiwhorld-released-generative-visuals-with-wiimote-and-windows/Fractice
Fractice is software by Chris Korda:
http://fractice.sourceforge.net/And to connect your Wiimote, you can use this script, in conjunction with the free, powerful game controller-mapping software for Windows, GlovePIE:
FractalBasic.PIE
GlovePIE
I’d still like to see people push fractals in different aesthetic directions, but I find this fascinating, nonetheless. Curious to see what folks do with it.
http://createdigitalmotion.com/2009/04/15/free-fractal-software-for-windows-playable-live-with-wiimote-control/ 