CCTV DVR. Additionally, Direc - TV DVR by Tivo allows an individual to pause a live feed, something considered impossible inside past. It all hangs on the hard disk drive capacity that is built to the DVR. cctv dvr resolution Surveillance systems with remote DVR viewer access are our specialty. CCTV security systems can be a single camera and monitor or they could be very elaborate. Cameras with Special Accessories: Certain CCTV cameras have special functions which are made for specialty uses.