Nostalrius Begins - Quality wow vanilla realm (1.12)

Im having the problem of actually streaming Nostalrius. I am currently using OBS and when I try to use game capture, Nostalrius doesn't actually show up in the list of applications that can be captured. There is only WoW 1.12, which when streamed is just a black screen. I have tried window capture but that means I have to play in a very small screen in order for it all to fit on effectively.

Do I need to use some other sort of program or something?

Edit: Got it to work, required a simple fix of running OBS in admin