Hello guys!
You know about the Box mask in the Node editor? Well… using the numeric inputs is quite annoying to me, so I made a more intuitive way for manipulate this node: With Drivers 
It’s not actually a tracking, I think…
You can see it on the .blend file below:
Compositing - Box Mask Tracking.blend (90.8 KB)
I don’t know if someone else already had ‘invented’ this, but it’s a lot handy… unfortunately the process to add a new mask is boring because it’s necessary to configure all the drivers for the new node…
You’re welcome to help to improve this. 
Sorry if this thread is in the wrong place