AVFoundation watchOS 8.0 Beta 1 to Beta 2 API Differences

AVAssetVariant.h
Removed AVEnvironmentalCondition
AVCaptureDevice.h
Added AVCaptureMicrophoneMode
Added AVCaptureSystemUserInterface
AVPlayerInterstitialEventController.h
Removed AVPlayerInterstitialEventObserver
Removed +[AVPlayerInterstitialEventObserver interstitialEventObserverWithPrimaryPlayer:]
Removed -[AVPlayerInterstitialEventObserver initWithPrimaryPlayer:]
Removed AVPlayerInterstitialEventObserverEventsDidChangeNotification
Removed AVPlayerInterstitialEventObserverCurrentEventDidChangeNotification