There are so many real surveillance cameras for little money that are made for the purpose already. For instance this outdoor model for less than $30:
To get real coverage you need different lenses in different applications and indoor and outdoor options as well. Installing cameras, wiring it all up and installing software and having storage, backups etc and keeping everything running is too much work to save a few bucks.
The hikvision cameras apparently are utter crap and worth avoiding.