SliceX/TrackX结合Mocha（荣获奥斯卡奖跟踪引擎）对其进行追踪，在你的素材里创建自由式遮罩…

SliceX lets you create instant Shape Masks to cut out layers or isolate effects directly in Final Cut Pro X without having to go into Motion or create the masks with an external program.

SliceX includes eleven motion templates for common tasks and you can also use the Shape Masks with built in effects, the built in color corrector or with third party plugins.

SliceX powered by mocha takes the pain out of following complex motion, just draw a shape and hit track.

You can then adjust with manual keyframes as needed.