[DonRotolo]

1676 records matches in small chunks, just over 2:30 long. Yes, it means an operator needs to babysit the camera, but would you leave a video camera unattended anyway?
We use the videos for scouting Friday night, pre-parsing them trivializes seeing what we need to see, and has the benefit of making them easier to upload to YouTube.

But regarding the OP: Yes, taking your own video is appropriate and allowed. And a good idea. You might be able to get up to the upper tier to video, which would be a great angle. If not, there are plenty of good locations up higher in the stadium. Remember, it is a football stadium.