OP
You should contact U to get a definitive answer.
My understanding from talking to vloggers:
It’s generally a no-go to film with phones on U attractions.
Go pro usage re POV on attractions is also a no, for the majority of us.
There is an exception for approved “press”, those with a pass that U has granted. These individuals are trusted to use a go-pro/mount that won’t hurt anyone. No, I do not know the application process involved. Again, you should ask U directly.
You can vlog in the parks, within reason, just not on the rides. If you would become a popular blogger, you might eventually be invited to visit during press events for new attractions, and could film at that time.