MediaDevices
The MediaDevices interface of the Media Capture and Streams API provides access to connected media input devices like cameras and microphones, as well as screen sharing. Available only in secure contexts.
Functions
The enumerateDevices() method of the MediaDevices interface requests a list of the currently available media input and output devices, such as microphones, cameras, headsets, and so forth.
The getDisplayMedia() method of the MediaDevices interface prompts the user to select and grant permission to capture the contents of a display or portion thereof (such as a window) as a MediaStream.
The getSupportedConstraints() method of the MediaDevices interface returns an object based on the MediaTrackSupportedConstraints dictionary, whose member fields each specify one of the constrainable properties the user agent understands.
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.