Where to meet players after match?

Hi, I am going to the Barca v Atletico Madrid match this Sunday at Camp Nou, I have seen that if you wait at the players exit after the match there is a possibility that they will roll down their car windows and possibly take a photo. I'm coming from Scotland and doubt I will get this chance again any time soon. If this actually happens could someone tell me where the players exit is? Thanks! Callum