First, you need to set IVS to on. Without that, it won’t work. That’s in the Smart Plan menu and it’s a big square box icon. Make sure you save the screen before you exit.
Then, in the IVS menu add an IVS rule and pick Intrusion from the drop-down box. Select ‘cross’ and ‘appear’, ‘specific’ and ‘human’.
The add the area. Left click to start the area and left click each marked point. Right click once the box is closed. If you’ve done it right the box should remain on the screen.
Then save it.
And that should work. The white water vapour sounds more like a motion detection alert. Make sure it’s turned off on the camera and the notifications are switched off for Motion detection and SMD+ in the app. In the app you need to add notifications for AI->Intrusion.
If you want a bit of help I’m only in Thetford so it’s easy enough to pop down for 20 minutes.
Technically all you need in terms of storage is a micro-SD card. I like the Synology Surveillance Station system, and Dahua obviously make their own NVR units. Get an NVR-xxxx-I unit for intelligence or a -X unit for quite a bit more intelligence. If you’re building your own then Blue Iris is the usual recommendation but Dahua supply DSS for free and it’s pretty good.