AVCapture No native camera clarity
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AVCapture怎么设置FOV
						AVCaptureConnection *connection = [self.videoOutput connectionWithMediaType:AVMediaTypeVideo];
						if ( connection.isVideoStabilizationSupported ) {
								connection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeAuto;
						}
可以缩小视野,谁知道怎么实现的吗?