Unity recently acquired Ziva, which specializes in the detailed animation of humans and other animals. They were known for their (not realtime) physics-based solutions, but now they have an ML model for faces, apparently. As far as I know, it's still in beta and not widely available. Unity says they will re-release this demo with the Ziva face in a matter of weeks and the quality will be even higher. And possibly allowing interactivity as well?? I guess we'll see in a few weeks.