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I have a video clip of a car driving by from left to right. My goal is to add a decal (mask) to the car door. Right now I am painstakingly moving the mask via X and Y.

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  • $\begingroup$ Use the motion tracker and parent your mask to the tracking points. $\endgroup$ – cegaton Jan 27 '15 at 17:56
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A mostly automatic way to do what you want is to use a Plane Track

The workflow is like this:

Load your video clip in the Movie Clip Editor

Create a tracker on your image by clicking while pressing Ctrl and pressing the tracking forward button (or CtrlT)

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Track at least four points within your video corresponding with the area you want to paste your "decal" to.

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Select all your trackers, go to the Solve tab and open the Plane Track control and click on Create Plane Track

A new shape will be created. (you might need to adjust the shape to match your needs) The deformation of that plane is controlled by the trackers.

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On the compositor use a Plane Track Deform Node (found in the Distort section). Connect it to your decal image, select your video source, camera, plane track, and mix it with the movie clip.

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The decal follows the movement and deformation on the video!

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