Build a box which fits the raspberry pi and the camera. The box needs a hole on the side to route the USB power cable through and a hole for the camera which is large enough to not obstruct the view. I mounted the camera on a roughly 45° angle so that it points downwards to be able to see the back wheels of the wheelchair. I used a standard box, but you can also 3D print a fancier version (maybe for Version 2)