Tracking shots with markers that move out of frame

Does anybody how this @ 4.42 is possible, http://www.youtube.com/watch?v=8_4F6P7p70I&list=UUd1fkZXu3C856d6LJWKOX9w
Basically how do you track footage with markers that move out of frame?
When i try, i just get a really bad solve error or it doesn’t work or i can’t track the whole footage

You always need to have a minimum of 8 active markers at all time of the footage. If a marker leaves the screen, another one has to take its place. To get a low solve error, you need stable markers and have them at different distances in the image to have enough parallax.