those are BNC connectors. pretty standard. these type of cameras are usually fixed analog cameras..
cameras have been phasing to Cat5/ POE allowing only 1 cable coming from the camera for feed and power regardless of quality 352 -> HD..
Also, when cameras become cat5's, the DVR will become an N/DVR, in most cases, not requiring any capture cards..
for brand of cameras.. iqeye. arecont. pelco has been popular.
for dvrs, 3xlogic (
www.3xlogic.com) is a local company that has lots of retail customers across canada/US.
I also do CCTV for a living.. (i work for a company that makes CCTV software)