addy osmani has coded https://github.com/addyosmani/getUserMedia.js which has a flash fallback, but the thing is that the flash fallback still needs you to implement a complete different logic then getUserMedia, so it's far from a perfect solution.

i raised the issue here https://github.com/addyosmani/getUserMedia.js/issues/2#issue... (and suggested a possible solution), but for this we would need the help of a flash megamind-ninja.