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This sounds like one small piece of common fingerprinting techniques.

It would have been nice to see the author address that possibility, but it seems fingerprinting is not mentioned.

IMHO, fingerprinting would explain the enumeration attempt, but not the attempt to access these devices.

Does accessing them give you extra fingerprinting data though? I would imagine that you can then enumerate at least the resolution of the camera.

This only allows you to specify a preferred resolution, but doesn't return the resolution actually available. Any device info is returned in the MediaDeviceInfo object [1] on enumeration (which doesn't include resolution or similar data).

[1] https://developer.mozilla.org/en-US/docs/Web/API/MediaDevice...

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