fxt sent over their new product called the "smart gesture box" It's an interesting concept, and I think what happens is that the camera talks smart audio to the VTX to control it (which you can make it do by covering the lens at the right time... I explain more here
Of course, if you are using a flight controller, it's pointless as you'd use the smart audio from the FC to the VTX to control your VTX settings via the OSD. So the question is: is there actually an application for this? I've thought perhaps a small plane where you might want to bury the VTX, but it's a bit of a stretch. Any ideas ?