Based on a previous screenshot, it appears the NVR put the cameras on the 172.16.1.xxx subnet.
So you would have to take say the first camera that would be assigned 172.16.1.151 and try to connect to it.
Now your LAN is a different subnet, so you have to temporarily put your computer to the camera subnet.
The instructions for a Dahua camera are below, so simply change 192.168.1.xxx to 172.16.1.xxxx
Unhook a computer or laptop from the internet and go into ethernet settings and using the IPv4 settings manually change the IP address to 192.168.1.100
Then power up your camera and wait a few minutes.
Then go to a web browser and type in 192.168.1.108 (default IP address of Dahua cameras) and you will then access the camera.
Tell it your country and give it a user and password.
Then go to the camera Network settings and change the camera IP address to the range of your system and hit save.
You will then lose the camera connection.
Then reverse the process to put your computer back on your network IP address range.
Next open up INTERNET EXPLORER and type in the new IP address that you just gave the camera to access it.