Interesting. On accounts with just a 22 series camera (V522IR or 722) and video analytics (which is included in the Surety Complete plan), Video Motion Detection rules are no longer an option. Should Video Analytics be removed, or a non 22 series camera be added to the account, Video Motion Detection rules should be made available.
Fortunately, you can use VA which should allow for better detection over VMD. More on Video Analytics here: