Teachers can now get honest feedback of their class and see whether the students enjoyed the lecture. They can get to know to focus on which student and which student is of what kind.

Since it will recording behavior/emotion of every student in the frame, this will help teachers to identify the not very active students of the class. It can also help in revealing any bully or introvert, and also bridge the missing gap between certain students and teachers (where teachers think something about the student when he/she is actually something else).