What are the benefits of CCTV cameras in a classroom setup?

Answer

There are now a few great products that allow teachers to record their best classes and, over time, create 'teaching-banks' of their best lessons. This 'teaching-bank' can be networked and accessed 24 hours a day by pupils who are sick or unable to attend school, as well as by trainee teachers looking to hone their teaching skills.
The market leading product internationally is Star Lesson (www.starlesson.com)
This will be one way of monitoring the children or students inside the classroom. With this, you could retrieve any recorded event inside the classroom that could be use to enhance the way the class is being managed. This will also be a medium to monitor abuses made not only by the students but also the teachers. Knowing that someone is watching over them would also miimize vandalism, bullying or even cheating inside the classroom.

Teacher's performance evaluation can be done on the basis of video footage. Moreover, any undesired event can be captured for administrative point of view.