In the video, a person is holding a smartphone with a thermal imaging app open. The app is displaying a thermal image of a person standing in front of a door. The person is pointing at the thermal image on the phone screen and then moves the phone to show the door. The thermal image shows the person's body heat in yellow and orange colors, while the door is shown in white and black colors. The person's body heat is more intense than the door, indicating that the person is warmer than the door. The person then moves the phone to show the door in more detail, and the thermal image on the phone screen changes to show the door in more detail. The video ends with the person pointing at the thermal image on the phone screen.