If you reach level 5 is it possible for them to ask for a video call? I don't think it's possible but I don't know exactly.
I have seen were a user was asked to engaged in a video call with the representative of the gambling site but it wasn’t actually classified as level 5 or something else.
The case was about one user whom the casino suspected to have used a stolen documents or had gotten the account through an illegal means (meaning he wasn’t the original owner of the account) and when asked to redo his kyc verification he did but with a different document and when he insisted that those were his documents the casino had to schedule a video call with him so that they could ask some basic questions about the account and his activities there but in the end he failed [according to them, he was seen asking someone for the answer and couldn’t provide them himself].
If this falls under level 5 then its shouldn’t be an issue though, just that it would be very rare before they (the casino) will ask for it.