Lori,
Looking at your video it seems to me that your search area must be too large as when the door opens, you are getting bad track. You will need to edit your search area to avoid the door opening. When the car moves offscreen at the end, you will then need to move the search area to an offset part of the car.
Ross Shain
Boris FX / Imagineer Systems
https://borisfx.com/products/mocha/