requestAutoFocus
Requests the camera to perform an autofocus in the region of interest. The autofocus won't work if the camera does not support autofocus modes.
Events emitted:
FrameProducer.Event.FrameProducerWarning.CameraNotInitialized If the camera is not ready to process autofocus requests.
FrameProducer.Event.FrameProducerWarning.UnableToAutoFocus If the camera does not support autofocus or if the camera failed to focus on the target.
NOTE: only one focus request is allowed at a time, if there are multiple request in a row only the last one is executed.
Parameters
meteringPoint
The target region of interest to focus on.