Track an effect to a moving object in Final Cut Pro

In Final Cut Pro, you can track the shape mask of a video effect (such as a blur, highlight, or color effect) to a moving object in a video clip.

Track an effect to a moving object

In Final Cut Pro, position the playhead in the timeline so that the object or face that you want to track appears in the viewer.
For the best results, make sure the object is in focus and has details with high contrast.
Open the Effects browser.
In the Effects browser, locate the effect you want to use and drag the effect to the viewer.
As you drag the effect over the viewer, rectangles appear over objects in the video clip and oval shapes appear over faces, indicating items whose motion can be tracked.
When a rectangle or oval shape appears over the object or face you want to track, release the mouse or trackpad button.
An onscreen tracker appears on the object in the video, and the effect is applied to the same area of the image.
Optionally, drag the sides and the corners of the grid to further fit the tracker to the object or face you want to track.
Tip: Fit the grid to the target object as tightly as possible, or even consider picking just a part of the object you want to track. (If the grid includes too much information in the background, it could potentially confuse the tracker.)
Confirm that Tracker is selected at the top of the viewer.
In the upper-left corner of the viewer, click one of the following buttons:
- Analyze: Final Cut Pro tracks forward from the playhead position, then tracks backward before the playhead until the entire clip has been analyzed.
- Left arrow: Final Cut Pro analyzes the portion of the clip before the playhead position only.
- Right arrow: Final Cut Pro analyzes the portion of the clip after the playhead position only.
Final Cut Pro adds a shape mask to the effect that matches the bounding box of the tracker, and the tracking data from the analysis is applied to the shape mask. See How does object tracking work in Final Cut Pro?
To view the tracking effect, position the skimmer (or the playhead) at the start of the clip in the timeline, then press the Space bar to play the clip.

You can repeat the steps above (with the same effect or a different effect) to track other objects in the same clip.

Adjust the shape mask of a tracking effect

In the Final Cut Pro timeline, position the playhead in a clip that has an effect tracking an object, so that the effect appears in the viewer.
Click Shape at the top of the viewer, then use the onscreen controls to adjust the effect’s shape mask.
See Add a shape mask to a video effect in Final Cut Pro.
If you make changes to the shape mask after the tracking analysis described in Track an effect to a moving object is complete, the changes will overwrite the existing tracking keyframe at the playhead location, which may cause an interruption in the tracking animation. To avoid this, you can do one of the following:
- Unlink the shape mask from the tracker before adjusting the shape mask. See Offset the position of a tracking effect in Final Cut Pro.
- Reset the tracking keyframes for the entire clip (or a section of the clip). See Add, rename, reset, delete, or duplicate motion tracks.

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Final Cut Pro User Guide

Track an effect to a moving object in Final Cut Pro

Track an effect to a moving object

Adjust the shape mask of a tracking effect