It's unclear if an RTSP video stream is available or if it's ONVIF-compliant.
It states it's "POE" (Power Over Ethernet) but it's not clear if it conforms to a desirable /reliable specification such as 802.3af/at concerning its claim about "POE".
I doubt you'd be able to stream video to an NVR.
The Reolink doorbell supports RTSP and ONVIF and many on IPCT are streaming theirs to a NVR. They can be had in a
POE version or a
Wi-Fi version (powered by the doorbell transformer) and sells for between 80 and $100 USD. I've had 2 Wi-Fi versions running very reliably since June '23, streaming to
Blue Iris ( a PC software VMS). They are the only Reolink product I recommend.
FWIW, I wrote to Reolink support to suggest / request a change in their app. Currently the only account level that can use 2-way talk with the doorbell is an admin. Normal user account can view, but is restricted from 2-way talk with a person at the door. This somewhat circumvents the purpose...
ipcamtalk.com