Camera stand is attached to the wheelchair armrest. It consists of an attachment (Super Clamp from Manfrotto), a flexible arm (Manfrotto Arm 237hD) and a camera holder (ballhead from photography supply store).
Photography supply store
Paid for by
See also rollingfstop.blogspot.com/2008/12/camera-mount-for-wheelchair-photography.html, last checked February 2017.
This tip is from 2008