But, what else do you need? You have a computer, you have NCS, you have a router. You need standard IP cameras with at least IP66/7 enclosure. I do not know how long distance it is between the camera and the wifi router, but you maybe need some extra antennas and access point outside. It is important to have a good signal strength since video demands a high data rate.
For the cameras, if you can find cameras that support the ONVIF standard it is easy to connect them to NCS or if the cameras is in the templates. Or you need to know the URL as we discussed earlier. If is it a well know brand of the camera it is often quite easy to find the correct URL.
I don´t know how much IT hacker you are, but .... The camera is most likely a standard camera. So you can do this. On the camera it is probably a Reset button. Push that button for some time and the camera will reset probably to DHCP mode. Connect it to the wifi on the router. Go into the router and find out the IP address. Connect to the camera using a browser http://IP-number. Well depending on your IT skills.