You will run into several issues with this approach however: it will take much time to use JavaScript to process all this information - just saving a frame as jpeg, converting it to blob and save it to the file system or indexed DB will consume most (or more) of the time budget you have available for a single frame. You can save out the frames using the canvas element by drawing onto it and store jpeg images to a local storage from the video stream together with the audio (which must be saved separately) and then in post use a library to create for example a MJPEG file (AFAIK there isn't currently any that supports audio). In pure local environment you can't and won't get a very good result.
Currently only supported in Firefox, and in an early state, but something to have in mind. UPDATE 12/2014 FYI, there is a new API on its way called MediaRecorder.
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