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FCP X only has basic masks for Ovals and Squares. Using CoreMelt's SliceX product you can create spline masks of any number of points and track them to movement using the academy award winning Mocha tracking engine. Isolate parts of the clip for color correction, vignettes, blurs, witness protection, adding depth of field, removing unwanted objects and many other uses.
This tutorial show you how to use the Mocha tracking inside SliceX to track movement for a variety of tasks.