Every established property has a camera system that grew by accretion: a few here when the building opened, more added after an incident, others inherited from a previous manager. Nothing matches, and replacing all of it is the quote nobody wants to approve.
The good news is that the mismatched system you already own is very likely the system you can keep.
Cameras added over the years
Coverage is rarely designed all at once. It accumulates, brand by brand, generation by generation, until the site has a dozen cameras and no two the same.
That patchwork is normal, and it is usually treated as a problem to be solved by ripping it out.
Why replacement is the wrong reflex
A rip-and-replace project is expensive, disruptive, and often unnecessary. The cameras mostly work; what has been missing is anything intelligent watching them.
Replacing hardware to add analysis is paying for the wrong layer.
Working with what is installed
Ocular reads standard camera streams regardless of brand or age, over the network, through one on-site computer. The mix that accumulated over the years is exactly what it is built to work across.
No new cameras, no rip-out, no capital request to get started.
Add the intelligence, keep the hardware
The upgrade a site actually needs is the watching and the verification, not another generation of cameras. Add that to the cameras already in place and the old system becomes a monitored one.
Keeping the cameras you already bought is not a compromise. It is usually the right architecture.