It works, but only if you have CamPlus active on the camera before you flash the RTSP firmware. Once the camera is running RTSP you can’t make any changes to the AI settings in the services tab and, in fact, the camera doesn’t list as having CamPlus active. However, if you look at the camera settings it shows as CamPlus and you get the AI notifications.
I found a post about this that was made quite sometime ago. Posting was by @jetstreamblue