To show a feed on an NVR without using camera ports, you can use an IP camera or a video encoder. Here's how you can do it:

1. Connect the IP camera or video encoder to the same network as the NVR.

2. Configure the IP camera or video encoder with the appropriate settings, such as IP address, subnet mask, and gateway.

3. On the NVR, access the device management settings and add the IP camera or video encoder as a network device.

4. Enter the IP address, port number, and authentication details (if required) for the IP camera or video encoder.

5. Save the settings and wait for the NVR to detect the IP camera or video encoder.

6. Once the NVR detects the device, it should display the feed from the IP camera or video encoder.

7. You can then configure the NVR to record the feed, set up motion detection, or perform any other desired actions.

By using an IP camera or video encoder, you can bypass the need for camera ports on the NVR and still view and record the feed.