I would need more information about your system. But you can try to extract a fresh copy on your desktop to see if videos run better or not.
In all other cases please drop a dxdiag report (as .TXT) here
after an animation in the game.
Press Windows + r key and type dxdiag -> save all information (as .TXT) -> Drop text file here.
It is. Try to move game.app to your "Application" folder or try to give permission either via Terminal.app or Permission fixer.
Open Terminal.app and type:
chmod -R a+x [drag and drop game.app folder hit enter]
Permission fixer:
https://f95zone.to/threads/permission-fixer-for-mac-and-linux.24233/