kd4e
Getting the hang of it
Assuming you already know that's not a very good camera at night with movement, then you'd power it with a 802.3af/at POE injector and the Ubiquiti with the 24VDC passive POE injector.
You'd connect the LAN ports of the 2 injectors with an Ethernet cable.
Assign a unique static IP for both radios and the IP camera, all in the same subnet.
EDIT: You could also power the Reolink RLC-510A cam with 12VDC, to address your introduction of the solar panel scheme.
So, the Ubiquity requires 24vdc but the Reolink 12vdc - so, either two separate power sources or else use a dc-dc converter for the second voltage?