     internal var longPressGestureRecognizer: UILongPressGestureRecognizer?
     internal var photoTapGestureRecognizer: UITapGestureRecognizer?
     internal var focusTapGestureRecognizer: UITapGestureRecognizer?
-    internal var zoomPanGestureRecognizer: UIPanGestureRecognizer?
     internal var flipDoubleTapGestureRecognizer: UITapGestureRecognizer?
     
-    internal var panStartPoint: CGPoint = .zero
-    internal var panStartZoom: CGFloat = 0.0
+    internal var _panStartPoint: CGPoint = .zero
+    internal var _panStartZoom: CGFloat = 0.0
     
     // MARK: - object lifecycle
     

        switch gestureRecognizer.state {
        case .began:
            self.startCapture()
            break
        case .ended:
            fallthrough

}

extension CameraViewController {

    internal func handlePhotoTapGestureRecognizer(_ gestureRecognizer: UIGestureRecognizer) {
        // play system camera shutter sound
