friend class QtCamCapability;
friend class QtCamVideoTorch;
friend class QtCamVideoMute;
friend class QtCamAutoFocusPrivate;
friend class QtCamRoiPrivate;
friend class QtCamCapability;
friend class QtCamVideoTorch;
friend class QtCamVideoMute;
friend class QtCamAutoFocusPrivate;
friend class QtCamRoiPrivate;