HIKVISION DS-2CD7185G0-IZS User Manual page 94

Steps:
1. Enter the ROI settings interface: Configuration > Video/Audio > ROI.
2. Select the Stream Type for ROI encoding.
3. Check the checkbox of Enable under Fixed Region item.
4. Set Fixed Region for ROI.
(1) Select the Region No. from the drop-down list.
(2) Check the Enable checkbox to enable ROI function for the chosen region.
Network Camera User Manual
Region of Interest Settings
93