If you are struggling with how to let the camera only detect people, then this article will be very helpful to you.
Applies to: Reolink cameras which can support smart detection function
Please refer to the detail in How to Set up Smart Person/Vehicle Detection via Reolink APP
If you want the camera only to record persons, please make sure you had inserted a Micro SD card or connect the camera to the Reolink NVR and go to Camera Recording Schedule.
Under the Alarm setting, enable the Person detection type only and choose the time and date you want for person detection. Tap the Save button to save settings.
Same for the Push notification/Siren/Email Alerts.