- (void)setSampleBufferDelegate:(id)sampleBufferDelegate
queue:(dispatch_queue_t)sampleBufferCallbackQueue;
+- (void)setAlwaysDiscardsLateVideoFrames:(BOOL)flag;
- (void)setVideoSettings:(NSDictionary*)videoSettings;
- (NSDictionary*)videoSettings;
- (CrAVCaptureConnection*)connectionWithMediaType:(NSString*)mediaType;