Motion tracking Motion 4

I've seen a tutorial recently where someone took a street sign and replaced one of the images with another image that somehow lifts off the sign. They used a matte and also motion tracking to achieve this. Does anyone know where I can find that tutorial?

If not perhaps you can help me. I have a client website that they recorded in Camtasia. Their logo has changed, yet that change hasn't been inserted on their website yet. I'm trying to wipe out their initial logo and insert their new one in it's place on their Camtasia movie. The movie zooms in and out, and also fades down to highlight spots of the website that they spotlighted in Camtasia.

Basically I need to match (track)the moves and change opacity when necessary. But I can't get a handle on how to do that. Any step by step help would be appreciated