What kind of footage is this and where can I get it? Can someone help me identify what kind of stock footage is this, I wish to swap out the text and the image on the stage for someone else. Is it green screen footage or an opener? 

Where can I get similar footage? I have had a google and to be honest I dont know what to google green screen stage footage?

Any help would be greatly appreciated :)
It's a (to be honest, quite old looking) 3D-Animation. I believe that looking into something like 3dsmax, Maya, Modo or Cinema4D might be the best bet for you. Otherwise you can search for "talent show display opener" as a Cinema4D template.