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Powerful camera installation detection

Since navigator.getUserMedia

I can request a camera stream. If the camera is not installed, errorCallback is called. But if there is a camera, the user will be prompted for a security prompt.

Is it possible to silently detect if a camera is installed so that I can create different UIs for that detection without bothering the user with a getUserMedia request?

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javascript html5 video-capture getusermedia


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