How to blur something in clip with motion?

D

DVX100Shooter

Veteran
FYI, I don't have any kind of motion tracking software or plugin. With that said, I have a clip where I am zooming out of a tight shot which reveals a banner in the background that I need to cover up or blur out. I know how to take a matte color and customize it to block out stuff. The problem I am facing is when the clip is zooming out, I need the matte to stay still. Its moving with the zoom if you follow what I am saying. I am thinking that I need to keyframe the matte so that it does not move when the rest of the clip is moving. Whats been happening is I place the matte where I want it and it looks good but then I play the clip back and the matte starts like on the ground and as the shot zooms out the matte moves into the correct place! I need to somehow have it start and finish in the same spot while the rest of the clip is in motion.
 
Nevermind I figured it out...For anyone else that wanted to know how to do this, this is what I did:

Copy the clip and place it in the next highest video track above the original clip. Add a blur (I used a Gaussuain Blur) to top copy. Then add a 4 or 8 point Garbage Matte to this clip. Go frame by frame and place edges where you need them and fine tune everything. If your shot has motion like a zoom or pan like mine did, you are going to have to keep adjusting the edges of the matte and will have to slide the matte in the opposite direction the pan or zoom is going. Final results didnt look bad at all.
 
Cool..a friend of mine today told me instead of using the Garbage Matte to use the Shape Matte in the shape of a square then trim it down to my needs. I agree with the stretched out keyframes.
 
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