If you know the size of the object and the distance it is away from the camera then sure, you can calculate the distance moved based on the variables the camera will send back however it's not exactly simple.

There is an old topic somewhere which touched on something similar to this (I believe it was for getting the distance to the object rather than how far it moved but it would be a similar theory) however I do not have time to search for it right now. When I get more time I'll do a search if you can't find it.

https://synthiam.com/Community/Questions/6120

Check here for some thoughts about measuring with camera.

Thanks for the info. Its too bad that there isn't some way to pull a scaled measurement of the line segments drawn by the 'show movement tracer' .... that being said I'll try whats been presented.

Cheers.