You’re correct. That is not a standard redirect URL. You could easily build some glue code to to look like an OpenID Connect compliant SP and then handle the redirect yourself. I am not super familiar with some of the OpenID Connect server options, but something like Hydra may be useful here. Perhaps some others from the community here can help with off the shelf options if you don’t want to code it yourself.
But coding it yourself may be the easiest, if you coded it in Node or something like that, it would be super simple, you’d have FusionAuth redirect to your node app and then you’d redirect to the video platform.