In Paris, I don't really know about filming inside.

I know the outdoors parades, people can just film.

The filmp about the show in Paris, which goes around on the net sometimes) was filmed by a person, who was invited to the premiere and also has some contacts with people from the parc (I believe).
So it might be that he asked to film it.

I really don't know how and what you can actually film and photograph in Paris (oh yeah, no backstage pics and stuff like that, and certainly not put them on the internet, that's all I know) ...