You must enable People Analytics on each camera that you want to use the following features:
On the Video page, hover over a camera and select the "gear" icon.
Toggle the People Analytics feature to "Enable".
Note: Additional permission is required to manage people analytics on your cameras. Please reach out to our Support team if you require permission.
Note: People analytics can only be enabled on one camera. However, you can disable people analytics on one camera and enable it on another whenever required.