getUserMedia method
The getUserMedia() method of the MediaDevices interface prompts
the user for permission to use a media input which produces a
MediaStream with tracks containing the requested types of media.
That stream can include, for example, a video track (produced by either a hardware or virtual video source such as a camera, video recording device, screen sharing service, and so forth), an audio track (similarly, produced by a physical or virtual audio source like a microphone, A/D converter, or the like), and possibly other track types.
It returns a Promise that resolves to a MediaStream object.
If the user denies permission, or matching media is not available, then
the promise is rejected with NotAllowedError or NotFoundError
DOMException respectively.
Note: It's possible for the returned promise to neither resolve nor reject, as the user is not required to make a choice at all and may ignore the request.
Implementation
external JSPromise<MediaStream> getUserMedia(
[MediaStreamConstraints constraints]);