Dahua's only via mouse, havent seen a NVR w/IR remote in a long time
My NVR came with a remote (model # in signature, below)
It's still in the original plastic bag. I never had much use for a remote.
Point is: whether a remote came in the box with the new NVR or not, the NVR
may have an IR receiver.
The are smart phone apps that can mimic a remote. Most use it to control TV, Stereo, etc. You configure the app w/ the make & model of the TV, and it fetches the correct IR commands and syntax from the web.
Logitech smart remotes operate similarly, and one remote can control multiple devices.
So some experimentation may be in order.... If you're optimistic.... Because it's likely a long shot....
Fastb