1) Film a short piece of film with a tracking point. For mine the tracking points were the corner of the buses sign, the number of the bus and the two headlights.
2) Import -> File -> And choose the video clip.
3) Choose what you want to be tracked. In my case the Thomas the tank engine face. I saved one off Google and on Photoshop took away the background. I then imported the file in After Effects with the video.
4) Next you need to check that the track points stay on track when the bus moves. You can either do this frame by frame or play the video and back track the frames. As the bus got bigger I had to change the scale of the tracking points.
5) Once all the points stay on track you can put your image on. Double clicking on the bus video on your timeline and go to the Edit Target in the tracking panel to the right of the screen. This should open a window which automatically chooses your image layer to be the target. It then opens a window with the axis. Make sure it is on the X and Y axis in the drop down panel. Ok this.
6. The Thomas Face is now on the bus. You should play through video to check the face sticks to the tracking and is in scale throughout.
7) Once it's all ok you can render your video and export it as a video. That video is above.
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