Understanding how motion models work in blender can be a huge time saver. Here's a quick example of how the affine motion model can save your bacon when it comes to object tracking a head.
Get the smoke asset pack for free: https://calzaath.gumroad.com/l/smoke (USE CODE "SMOKE")
Download
0 formats
No download links available.
Tracking in blender: Why motion models are important | NatokHD