How to set Camera view aspect ratio in iOS

Sometimes we face problem with Camera view aspect ratio in ios. Solution to this problem is here.. Set its aspect ratio property to AVLayerVideoGravityResizeAspectFill. It actually preserve aspect ratio; fill layer bounds.

1. AVLayerVideoGravityResizeAspectFill may be used when setting the videoGravity
2. property of an AVPlayerLayer or AVCaptureVideoPreviewLayer instance.

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