Need Help Modernising An Old Camera System

I was asked to help "modernise" an old camera system. The cameras are about about 10 years old (if not older). I can not see the exact model of the cameras, being that they are to high up. However, they are currenly hooked up to a Intellex DVR. Some a standard cameras while others are PTZ.

I have two thoughts on how to do this:

1 - The intellix has a network card put in...

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