Maybe I didn’t understood the question but it can be done in Motion. This response has a video link to demonstrate what I mean. (I tried to embed the movie and couldn’t get it to work)
This is how it was done:
-Text layer was added above the layer with the Jar movie.
-Match Move behavior added to text layer
-Hit F2 to open Behaviors tab
-Make sure Type = Transformation
-I attached the anchor to the left handle of the jar
-Select the Scale Adjust button so Position and Scale are enabled
-You will get a new option below Anchor called “Rotation-Scale.”
-Place it on the opposite end of the jar (right handle) so motion can figure out the scale.
-Click on the Analyze button and you’re almost there. It probably wont line up right.
-Select the Anchor Point tool and move it to were the Anchor was set (left jar handle)
Obviously my example will be easier to track due to the almost solid background, but with some work you can have a killer effect. Hope this helps and best of luck.