If you are using a computer, will it record video without an NVR?

No, the closest workaround is to add the camera to the CMS. The CMS saves snapshots based on facial recognition. Please keep in mind that if the CMS doesn't see specific points of a face to realize its a face (such as if the person is partially covered), you may still get a temperature read, but the face snap may not save. The CMS is only saving snapshots, not video.