You could simply add Widget in the scene.
Qt Code:
  1. main()
  2. {
  3. QWidget *widget = new QWidget();
  4. // set the layout on widget;
  5. // add play styop buttons to widget;
  6.  
  7. QScene scene;
  8. scene.addWidget(widget);
  9. QGraphicsView view(&scene);
  10.  
  11. view.show();
  12. }
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