I watched the video, and it seems that the big authenticator is that you can see the room reflected in the window and that the alien's face is behind the reflection. That would make perfect sense if you were shooting in a normal video mode, and picking up relected light from inside the room, but the guy was shooting in a night mode. If the camera were picking up IR/heat energy, the camera can only see things that vary in temperature. It would see the alien, it would see the window and the glass, but it would never see a reflection in the glass as a reflection has no temperature that's different from the glass. The guy who made the video specifically said his camera was in an IR mode.
The only way this video could be made was if it was first shot in visual light, and then modified to look like it was shot in an IR mode.