Well, it's opt-in. So unknowing access is (at least without further actions) not possible.
getUserMedia: "Prompts the user for permission to use their Web cam or other video or audio input." [1]
By the way: The example doesn't work for me either.
getUserMedia: "Prompts the user for permission to use their Web cam or other video or audio input." [1]
By the way: The example doesn't work for me either.
I don't know if how you'd sent it somewhere with the same origin policy in place.
nope, the "use webcam" permission is per "getUserMedia" call, so 2 getUserMedia calls = 2 allowbar popups.
It's possible that some day there will be a browser bug for bypassing it, but you can't just write javascript code that says "don't ask for permission".
Nowadays the majority of webcams also hard-wire their 'on' light, so the user would at least get an indication that the webcam is suddenly recording.