A helper object to interact with cameras.
Get a list of cameras (if any) available on the device, a camera access permission is requested to the user the first time this method is called if needed.
If the browser is incompatible the returned promise is rejected with a
When refreshing available devices, if updated deviceId information is detected, cameras' deviceId are updated accordingly. This could happen after a camera access and stop in some situations.
Force a call to refresh available video devices even when information is already available.
Hint that a camera has already been accessed before, avoiding a possible initial camera access permission request on the first call, in cases this cannot be already reliably detected.
A promise resolving to the array of available Camera objects (could be empty).
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