QT Wayland compositor example not playing videos

Greetings,

I am working on my own Wayland compositor and have been extending the official example in C++ known as minimal-cpp. However, I've encountered a problem: the compositor is unable to handle videos. From the information I've gathered online, I understand that the surfaces and sub-surfaces of the views should be handled automatically by the Qt framework, including any communication with OpenGL.

There's another example in QML, also called minimal-qml. Interestingly, this example is capable of playing videos, something the C++ example can't do.

I require this capability in the C++ example, so I'm left wondering why the minimal QML can handle video formats, while the minimal C++ cannot.
What's more, the QML example supports both xdg and ivi surfaces, but if I disable xdg surface, it too becomes incapable of playing videos.

I would greatly appreciate it if someone could assist me in understanding this issue, particularly in regards to handling video formats in the minimal C++ example.

Thank you for your help in advance.