One of my classes at IIT-M from 15 y ago or so is there holy shit. Haha! So what would happen is they'd put this single camera operator at the back of the class behind the last row. There was only one classroom where we had it.

The prof must have been mic'd up because the audio comes through quite clearly. We weren't told to act any specific way or anything and no students were told explicitly that it was for NPTEL.

But it wasn't recorded in a studio, just a normal classroom with students.