Gestures + Reveal.JS
chromeexperiments.com
chromeexperiments.com
* multiple directional scrolling * hijacking my back button
At least they're trying. I would think you'd need something more sensitive than a normal webcam for gesture detection, so that's a feat in itself.
Getting Leap Motion integrated with Chrome would be amazing, because, you are right, the webcam alone does not seem to be precise enough, as the author said:
It took me a while to write and fine tune the detection algorithms. Even then, the algorithms are only about 80% accurate
[1] https://www.leapmotion.com/
[2] http://news.ycombinator.com/item?id=5179335 and was not the first time: