I think the glasses are different because they are not as easily spotted as other video recording devices.

That's not true at all, we've had cheap tiny hidden bodyworn recording devices for a long time.

Instead of glasses how about a cross: https://blackpointsecurity.com/products/black-cross-necklace-hidden-spy-camera-with-dvr.html

Or maybe in a pen in your pocket: https://blackpointsecurity.com/products/mini-spy-full-hd-pen-recorder-camera.html