To give some extra help to trackers in Fusion, I developed a method of using Sobel Filter for edge detection and few other filters to prepare the image so its far likley to be successfully tracked. Since I started doing this, my success rate has skyrocketed. I just have a group as a template I drag and drop now before the tracker to prepare the image, track it and when it is a success, I hook the tracker back to original footage. Works really well.
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Another great method is that if there is a color one can track. I use 3DKeyer or some other method to select the object by color and than track just hat on transparent background. It essentially acts as occlusion mask. Works really well with objects one can detect with color. Now with magic mask one can use Magic mask to track all kinds of objects first. Than use that for point or plainer tracker. Or as exclusion / occlusion mask for 3D tracker.