PS: Just added de debug flag for QT, show this:
QFactoryLoader::QFactoryLoader() checking directory path "/home/madkoding/download/vtuber-webcam-linux-64/platforms" ...
This application failed to start because it could not find or load the Qt platform plugin "xcb" in "".
PS2: also no "platforms" folder exists inside vtuber-webcam folder
PS3: I'm using a fresh new install (Ubuntu 21.04)