Here is the full error message for PyQt6=6.7.0:
No QtMultimedia backends found. Only QMediaDevices, QAudioDevice, QSoundEffect, QAudioSink, and QAudioSource are available.
Failed to initialize QMediaPlayer “Not available”
Failed to create QVideoSink “Not available”

Here are a couple things I tried:

1. Reroll version back to PyQt6=6.6.1. This results in an error as well: ImportError: DLL load failed while importing QtGui: The specified procedure could not be found.
2. I thought that missing ffmpeg might be the issue so I installed it, but the issue persists.
3. Tried the setup on Ubuntu (WSL2) and the issue disappears, but there is just a black screen and nothing gets displayed in the widget.

I understand that the underlying code will help in debugging but cannot reveal code unfortunately. Any help will be much appreciated.