For (cinematic) sounddesign the quality is not nearly good enough yet. For simple home-style videos dozens of (more fun) options exist - foley, free sound libraries, freesound.org, going out with a phone and record stuff.
https://www.youtube.com/watch?v=ngZ0K3lWKRc
Hayao Miyazaki, 7 years ago, on AI generated motion capture.
These are hilarious.
This the first time I heard AI Simlish. I wonder what the training data was. Seems like work is done by John Hopkins and Tencent, but the fake AI language sounds... Indic? Are there other examples of AI generating speech in... hallucinated languages?