If I remember correctly, you'd better go to the school security office to prepare a case first (probably behind the information building leading to Xiyuan), and then he will agree whether you want to watch the surveillance. The monitoring place is in the library, which is the first floor of the north gate of the main building. It seems to be the right hand side when you go in, and you turn in a particularly inconspicuous place, which is probably the position. But basically, people who watch the monitoring have a bad attitude. There are many bad ones, some are not opened, and some are not photographed by surveillance.