The problem with the Mac’s camera is that it only faces the person in front of the computer. This is unlike iPad/iPhone, which has lenses facing both ways. So I thought why not 3D print a widget with two mirrors attached, that sits atop the computer? The part would work like a periscope. This way, teachers could record students without students being distracted by seeing themselves on the computer monitor.
Here is a sketchup version of the design 
Occasional Observations of Traveling Technology Coach 