Why the hassle with a CCTV cam and separate DVR. Today’s dash cams are cheap and with everything integrated it’s an easy installation (one power cable to your cigarette lighter). Most dash cams support up to 32GB of mini sd card storage. I have been using dash cams for years now and I like the little “insurance” in the event something happens.
All have a wide angel field of view. You can setup continues recording and automatically loop if the storage becomes full. I like the ones I have because I can setup file sizes in minutes increments. For example, after 15 minutes of recording start a new file name. It makes it extremely easy if you wish to go back and review a specific time period.
You can easy remove the SD card and view the recordings on your PC or laptop or you take the cam and connect it to your tv. Different models have different options, but they are basically all the same. For $40-60 you can get a very decent cam of clear video quality. Most dash cams have an option to automatically save a set amount of second before and after an impact, i.e. crash.
The only thing all dash cams have in common is the pathetic battery life. They literally turn off after a minute when disconnected from a 12V source.