Access live stream from camera direct, through HIKVision NVR?

The devices that need to talk are Cameras, NVR, and NAS (Scrypted is hosted within Docker on the NAS). The cameras are wired to the NVR, the NVR is connected via wired Ethernet (externally round the house in trunking) directly into the main Orbi router. The NAS is connected via ethernet into the same Orbi router.

The Mac is not involved at all in the process.

The NAS does have a secondary network port though, so maybe that could be configured?
 
It's a Synology NAS model DS918+ I can't see a way of adding a secondary IP address into the NAS system.

NAS Ethernet connection configurations. Only the '202' port is used.
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For test purposes I did try to add the NVR network onto the Mac:

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I think I may have done something wrong though as I still can't ping any of the cameras
 
I think I may have done something wrong though as I still can't ping any of the cameras
Gateway should point to the Cam network gateway (192.168.254.1)
If changing the "router" setting from 192.168.1.254 to 192.168.254.1 does not work for you, go get a simple unmanaged switch and put it between the cam port and Lan port at the NVR


With that NAS, you would add a cable to the second port or add network switch, and plug the two ports coming out of the NAS together. Then manually configure the second interface in the NAS to the CAM IP network (like 192.168.254.101)
 
Otherwise, the more expensive way to connect the NAS to the NVR is taking the second port and putting it on its own wifi bridge back to the NVR's CAM port.

BTW, I think I went through all the ways to connect these things together.