It is nothing unusual that a casino would ask for some additional information, to tell you the truth.
I surely understand that you feel like they are trying to avoid paying you, but I hope that sonn they will approve your video provided and you will withdraw your winnings.
Have you got any news regarding all this, by now?
I saw that you have filed a complaint, and our team has already started to work on it, so you are surely in good hands. Just be a bit patient, and hopefully soon we'll be able to move forward.