In the Eufy app, open the camera and tap the settings icon at the top.
Tap Storage, then NAS(RTSP).
Tap Yes on the Setup Guide, follow the instructions, and when you're asked
"Select which type Video you'd like store to your NAS:" select Continuous
Recording.
On the RTSP Security page, use the default Digest authentication and either
accept the default username / password, or create your own. Copy the
generated rtsp:// link.