IMHO. I think everything in moderation.
While I don't spend a lot of time focusing on myself, I do ( from time to time ) turn the camera 180 for a brief introduction. I think it makes the video more personal. I do this for handcam and outside video.
I will as well briefly video manifest, pilot (if available) and or packers. I think it gives the viewer a feel for the good vibe we have going on.
I have seen body parts done tastefully as well. It creates depth and orientation. It should never take away from the student.
Taste, feel, moderation. Overkill is under rated.