It was CGI shown on the video screens in the stadium. They scanned a copy of the stadium into the game engine like they do for Madden/NCAA Football game (Unreal Engine is a gaming engine) and used that to make the Panther move around the stadium properly in the CGI. Then it was a matter of just running it in such a way that the render cameras matched up with the on field cameras (and some of it was pre-recorded so that was even easier). Once you have it, you can use it any time with a different banner each game if you want. Real-time CGI like this is getting easier and easier.I'm not sure how they did this one for the Panthers. What would you do with an elephant?