Instead of mounting my camera on the handlebars, I mounted it atop a 2" angle bracket onto the right side of the bike, near the head.
I hate it when the camera pans around wherever the handlebars point. Mounting the camera on the frame will prevent that. I had to tiewrap the brake cables outa the way of the camera lens.
Fearing that the camera would work loose during the ride, I looped its handle/string around the downtube. It's easy enough to remove the camera when parking the bike.
In bad weather, I'll wrap a ziplock bag around the camera. I should still be able to shoot the video in the rain.