For tracking, the background will also be blurred..But you still
can tell which is panning, which is tracking..
For tracking, the car is in perfect focus if you do it
correctly..
For panning, MOST of the time some parts of the moving object won't
be in focus..e.g the front of the car or the rear of the
car..correct me if i'm wrong..
The picture of the Merc DTM you got from Wiki I assume..if you see
properly, the front of the car is a bit out of focus..