I know this a really old post but I thought I'd answer it for those Googling.
By default Genius Vision sets cameras to 'Unconditional recording', which is recording 24x7. You can change this in the 'Camera setup' dialog. There are more details here http://community.geniusvision.net/platform/cprndr/ta/gvrapidans/entry-h.xv5z3upo51hz.html