getCameras() starts video access, while ideally it should only report available devices

[mebjas]

Actually reported in #38 by @kenfookchoong

If possible it'd be good if this API only queried the list of cameras and not start video access.

This issue has been verified on Android, IOS and Mac

Tagging @OneDivZero for visibility

[mebjas]

The problem with this one is without camera permissions one cannot get the label of the camera device as per API specification - https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/enumerateDevices

This is a very good this from privacy point of view.