Transparent VideoWidget or VideoPlayer in a dialog using Qt::WA_TranslucentBackground

A VideoWidget or VideoPlayer present in a dialog or MainWindow with Qt::WA_TranslucentBackground set will be fully transparent, showing a hole in the dialog where the video should be, regardless of AutoFillBackground being set in a widget between VideoWidget and MainWindow or even on the VideoWidget. Case included. No handling created to exit fullscreen so you'll have to alt-f4 out.