Camera tracking is a fabulous technology that allows us, through a real footage, capture the movements of the camera and create a digitized version in Blender. Besides the camera, we can also captured landmarks, thus we can make a composition of virtual + real footage elements. It offers a lot of possibilities, ranging from putting a flying saucer over a city linked to the use in retail advertisements, such as those where prices appear, usually with an explosion or earthquake.
The terrain itself was scanned using photogrammetry shortly after the video was recorded. The pictures were taken with the same camera, the 3D might be used up for subsequent animation, because the light was consistent with that presented in the recorded scene.
The video above shows a proposed activity in one of my classes taught in a production company here in my town (Sinop-MT, Brazil). The objective was to test the tracking and apply the animation on the face of a reconstruction of an young Egyptian of the Roman period. By doing so, the movements would be much more natural than simply animate a face manually.
We take the opportunity and tested the 3D facial tracking to replace the head of the individual filmed by another team member.