Yeah I heard some people do that instead. So it's not an unusual request. Having said that, I always tell people that they are better off doing a presentation in class and have someone film you with professor's permission. You get a footage of what your body, your hands, your face does when you are anxious in front of live audience. For example, some people discover that their hands flap a lot or they stare into a void a lot and they can fix that. Some people discover they have eye rolling tics or winking tics and they know to disclose that next time. Some people who stutter may discover what their secondary behaviors really look like on the outside.