For me there are simply bugs in tracker in Fusion. There is a comparison with tracker in Color page which is working like a charm.
The tracker in Fusion behaves very irrationally most of the time.
It has tendency to jump from frame to frame to a point which is DEFINITELY outside it's search region, and it can come back after few frames like nothing happened.
It is very shaky. Look at this example: it looks like every second frame it is tracing some different image. It starts at some moment and later vanishes.
- fusion tracker 01.png (758.52 KiB) Viewed 3227 times
As you see the tracker has to track 3 huge black buttons on white background. And still every second frame is pointing at the trees behind. And as you see on the right there are also triangles where there is one correct frame followed by 2 frames completely off and coming back. For me it is a bug.
This affects both the planar tracker and a "tracker". I have NEVER achieved real success with tracker in Fusion. On the other hand the tracker in "Color" works fine almost every time.