you should confirm the Camera support IVS function
you should access to the camera website and click (setting-event-smart plan) to enable IVS.
You should add the rule (Tripwire, Instruction, Abandoned Object, and Missing Object)
click Draw rule and draw a rule, click to right button to finish.
click the Alarm page to enable the IVS.
When someone triggered the rule, the alarm page will make some logs.