I recently setup a camera pointing down at my keyboard/mouse instead of my face for demonstrating a keyboard that I built (analog hall effect--from scratch!) and I think that's good enough to let people know, "I'm here" without being super distracting (assuming I turn off the LEDs and the gigantic LED matrix display haha).

This is going into the realm of the kind of monitoring software that tracks your eye movement to make sure you're concentrating.

If people are not paying attention to whatever you're presenting in your meeting, maybe the meeting is not relevant for those people. Consider cancelling it.