Step 1: Input the NVR user name.
Step 2: Input the NVR password.
Step 3: Select "Login".

Step 4: Select “Setup”.

Step 5: Select “Camera”.

Step 6: Select “Privacy Mask”.

Step 7: Choose the camera channel.
Step 8: Select "On".
Step 9: Select "Draw Area".
Step 10: In Camera View, draw a privacy mask.
Step 11: Select "Save".

Step 12: Successfully added the privacy mask.