Re: How to check if permission denied?

Martin Thomson wrote:
> I don't see this as gUM.  Maybe there is an adjunct API that produces
> a MediaStream from a file.

We've talked about a captureUntilEnded on the <video> tag before, but 
that requires the application to be written so that it can use it. I 
think the idea behind allowing users to select a video file instead of a 
camera is to let those who don't want to share a camera (or possibly 
don't even have one) use applications that were not otherwise designed 
to work in this scenario. I.e., it's about user-empowerment, not about 
providing a technical feature in the API.