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.
Depending on device features and user permissions for camera access, any of the following errors could be the rejected result of the returned promise:
UnsupportedBrowserErrorPermissionDeniedErrorNotAllowedErrorNotFoundErrorAbortErrorNotReadableErrorInternalErrorA promise resolving to the array of available Camera objects (could be empty).
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A helper object to interact with cameras.