If you want to film someone walking and would prefer not to set up a tracked camera for whatever reason, you can hire a modified treadmill from Matter SFX.
The original treadmill had an enormous touch screen with a lot of unnecessarily complicated options, and so I was asked to create a simpler interface that would be more suitable for the special effects industry.
Designed to be rugged and foolproof, these photos show the control unit before it starts its tough regime of being thrown into the back of vans, dropped off scaffolding and covered in baked beans etc.