AVFoundation macOS 10.14.1 to 10.14.4 API Differences

AVCaptureSession.h
Declaration
From@property (nonatomic, readonly, nonnull) AVCaptureOutput *output
To@property (nonatomic, readonly, nullable) AVCaptureOutput *output

Declaration
From@property (nonatomic, readonly, nonnull) AVCaptureVideoPreviewLayer *videoPreviewLayer
To@property (nonatomic, readonly, nullable) AVCaptureVideoPreviewLayer *videoPreviewLayer

AVContentKeySession.h
AVSampleBufferDisplayLayer.h