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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 shows you how to track masks inside FCP X in order to pixelate the image for witness protection or in order to do skin smoothing effects.