Clone Hero - F.C.P.R.E.M.I.X. by The Fall of Troy - Pro Drums - 99% 7 Stars 

No worries! The background is basically an MP4 recording of the song in Performance Mode on RB3 Deluxe - a modded version of RB3. A guy named Jloe01 shared this and a bunch of other recordings of songs from both GH and RB on a Google Spreadsheet. I'll put the link in the description. To use the video as a background, you have to put the video file (MP4 works, not sure about others) into the song's folder. You'll also have to name the file "video"

@@anf9311 thanks for the response, is there a video tutorial or anything to guide this or if possible even link the release page to download? Thanks :)

@@Joker36094 I haven't seen one specifically for this, but there very well could be. I would search for something like "Clone Hero add background video" on YT and also if you use Reddit, join the CloneHero subreddit - very helpful and friendly community!