The camera is attached to a stand, see associated tip. The lens cap is attached to the camera strap with a string so it does not get lost.
Camera accessories include an infrared remote control that allows wireless activation of the camera shutter and zoom adjustment. The remote control sits in a holder on the back of the wheelchair and is operated with a mouth stick.
The attachment can also be used for an umbrella.
Today several cameras are available that feature remote control as a standard accessory.
Photography supply store
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See also rollingfstop.blogspot.com/2008/12/camera-mount-for-wheelchair-photography.html (last checked February 2017)
This tip is from 2008