More like a rotoscoped bitmap animation than what we consider 3D motion capture now.

This book [1], which is the creator's diaries from the time annotated with lots of memoir-ish details, is really really good and talks about how the motion capture came to be at length. It's also just a very enjoyable book, not to mention very physically beautiful.

https://www.google.com/books/edition/The_Making_of_Prince_of...