There are quite a few commercial products that can do what you want, the industry is called CCTV (Closed Circuit Television). Although WEB cameras could be used, a major drawback is running ethernet to the parking lot poles. Most people use RG59 coax to connect the camera runs to a CCTV video switcher or a video card with multiple inputs. The video is usually stepped through or displayed in realtime in quadrants on the screen so you can observe all cameras at once. Try a WEB search on CCTV and you will have hundreds of vendors trying to sell you this type equipment.
Lightning is always a problem with cameras located outdoors and piping lightning into your ethernet hub or switch is certainly no a good situation. We have several hundred cameras and lightning, even nearby, is a severe problem. The best system is to covert the outputs from the cameras to fiber video transmission at the pole top to protect the cable run both to the pole and to the interior switcher. Use lightning isolators at the pole end as well as the inside end if you run coax for your connections. Aditionally, cold weather, rainy and hot weather usually require a small heater and fan to be in the camera housing
to reduce the condensation and fogging of the lens.
Many alarm distributors sell this equipment to anyone for business purposes. MCM electronics sells CCTV gear via the WEB too so anyone can buy it.
