The Brinno Duo Smart Peephole DoorCam enlists, you guessed it, your door’s peephole to keep watch. BY MEGAN WOLLERTONJANUARY 9, 2019 6:00 AM PST Meet Brinno’s Duo cam.Brinno Brinno’s Duo Smart Peephole DoorCam replaces your existing peephole to keep an eye on your front door. The startup says its DoorCam is simple to install and can be retrofitted to doors with peepholes. Rather than recording a video clip when the motion sensor detects activity, the Duo cam is supposed to…