Zooming while capturing video using AVCapture in iOS

Question

I am using AVCapture to capture video and save it. But I need to provide zooming option like pinch to zoom or through a zoom button. Also video should be saved in exactly in

Answer 1

Add UIPinchGestureRecognizer object to your and handle callback like this:

- (void) zoomPinchGestureRecognizerAction: (UIPinchGestureRecognizer *) sender {
    static CGFloat initialVideoZoomFactor = 0;

    if (sender.state == UIGestureRecognizerStateBegan) {

        initialVideoZoomFactor = _captureDevice.videoZoomFactor;

    } else {

        CGFloat scale = MIN(MAX(1, initialVideoZoomFactor * sender.scale), 4);

        [CATransaction begin];
        [CATransaction setAnimationDuration: 0.01];
        _previewLayer.affineTransform = CGAffineTransformMakeScale(scale, scale);
        [CATransaction commit];

        if ([_captureDevice lockForConfiguration: nil] == YES) {
            _captureDevice.videoZoomFactor = scale;
            [_captureDevice unlockForConfiguration];
        }
    }
}