I would recommend a dedicated CCTV system, that way once it is installed and configured you can just forget about it. Likewise if your ISP goes down or your router falls over you will still have security. I bought a not so cheap swann system, installed set to record on motion detection and has night vision. If anything happens I have a nice HD video of when, where, what and more importantly who . Hooked upto the TV so makes a great video entry device so I can be lazy (or ignore the inlaws dropping by) Network enabled so I can sit at work and take a look or just use the smartphone app. Worth considering there are cheaper options on ebay that are just as good but depends if your willing to wait on delivery?
CCTV Kits - CCTV and Security | Maplin - The Electronics Specialist