DISCLAIMER:
This demo "application" is little more then a hack I had laying around after playing with jsqrcode a bit. It was pushed mostly to answer a question on stackoverflow.
JSQRCode Scanner is a demo of how you could build a QR code scanner in the browser. It makes use of jsqrcode and getUserMedia.
It has no tests, messy code, bugs and will probably crash. If you manage to get it working; try holding a QR code in front of your webcam to unveil the magic. I managed to get it working using the latest chrome canary build.
enjoy.