Sure, if the DVR has the software / functionality to connect ot IP cameras. What is the make / model numbers of the DVRs being used?
If it does, there is no need for a physical connection, just type in the IP address and credentials of the camera into the DVR configuration tool and done.
That said, most low to mid Level DVRs do not support IP cameras.
IPVMU Certified | 07/17/15 06:46pm
They aren't hybrid DVRs. Watchnet 16-channel analog E-96032RTD1.
IPVMU Certified | 07/17/15 07:06pm
When you say Analog DVR I am going to assume it only has Analog inputs. If so, your only real chance is if the camera happens to have a utility NTSC output. Many IP cameras do, many don't. For instance, Axis cameras as a rule don't, but Samsung cameras often have them.
Also, where the analog connection is may not be obvious, on the Samsung SNB-5004 it comes out of an unusual connector, so it could be missed.
Short of that you could use a IP decoder, but that is likely to cost as much as a camera, so...
Pro Focus LLC | 07/17/15 08:44pm
Chris and John have this covered pretty well, so I will take another angle. What about replacing the existing DVRs with a Hybrid/Tribrid unit that can accept Analog SD, Analog HD, and IP cameras? A 16 channel Dahua based unit should be under $400 sans HDDs. You could swap them both, or just one.