My gesture library ported to iOS, running on iPad 2 using the front-facing camera. Added head tracking with OpenCV for Head-Coupled Perspective (HCP).
It's an early prototype for an ongoing project at the NCCA, Bournemouth University.
The system is implemented in C++ and some Objective-C (for iOS glue code), powered by openFrameworks. The values will have to be filtered to reduce the "jumping" that still occurs sometimes. Stay tuned!
See http://www.aaweb.ch for more information about the gesture library.
UPDATE: Also check out the newer video: vimeo.com/22701406