If you have confirmed that you have enabled motion detection in the camera settings but it is not exposed to Home Assistant, maybe it is not yet supported.
You can take a look at Frigate NVR-
This NVR is SUPER POWERFUL in my opinion. Very easy to use and it supports motion detection as well as object detection.
Therefore, you can create a notification that ONLY notifies you if it detects a PERSON.
Edit: it appears you have used Frigate 