VideoWidget: make the constructor explicit and add Q_DISABLE_COPY
VideoWidget: make the constructor explicit and add Q_DISABLE_COPY

tswindell/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,tswindell/qt-gstreamer,GStreamer/qt-gstreamer,tswindell/qt-gstreamer,cyndis/qtgstreamer,ylatuya/qt-gstreamer,dejunk/gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,iperry/qt-gstreamer,knuesel/qt-gstreamer,GStreamer/qt-gstreamer,nasserGanjali/QtGStreamer,nasserGanjali/QtGStreamer,comicfans/libqtgstreamer,dejunk/gstreamer,shadeslayer/qtgstreamer,knuesel/qt-gstreamer,comicfans/libqtgstreamer,detrout/qt-gstreamer,cyndis/qtgstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,cyndis/qtgstreamer,shadeslayer/qtgstreamer,nasserGanjali/QtGStreamer,ylatuya/qt-gstreamer,detrout/qt-gstreamer,GStreamer/qt-gstreamer,knuesel/qt-gstreamer,iperry/qt-gstreamer,iperry/qt-gstreamer,ylatuya/qt-gstreamer,dejunk/gstreamer,shadeslayer/qtgstreamer,comicfans/libqtgstreamer,detrout/qt-gstreamer