Unless I'm misreading, it's not available at this time:
> RTSP was considered a beta feature and we are currently assessing the path forward as the firmware versions have aged quite a bit. We have removed the firmware files for these versions for now and we’ll update the pages when plans are finalized. Please note that firmware files take a while to work on and test so you may not see an update in the near future.
Idea: could you cut off external network access and then point a server (e.g. HomeAssistant server on RPi) to the RTSP feed from the camera within your network?
> RTSP was considered a beta feature and we are currently assessing the path forward as the firmware versions have aged quite a bit. We have removed the firmware files for these versions for now and we’ll update the pages when plans are finalized. Please note that firmware files take a while to work on and test so you may not see an update in the near future.