Change a clip’s opacity in Final Cut Pro for Mac

One way to combine multiple clip images is to change the opacity of the topmost clip in the timeline, so that the image from the clip below it shows through.

Position the playhead in the Final Cut Pro timeline where you want to add a clip above the primary storyline.
Select the clip to add in the browser, then choose Edit > Connect to Primary Storyline (or press Q).
To see the composited clips in the viewer, position the playhead within the clip that was just added.
By default, the new clip completely obscures the clip in the primary storyline.
To make the new clip partially transparent, select it in the timeline and adjust the Opacity control in the Compositing section of the Video inspector.

The closer the Opacity setting is to 0 percent, the more transparent the clip above the primary storyline becomes. You can also use the Opacity fade handles in the Video Animation editor to have the composited clip dissolve on and off, or you can add keyframes to have the opacity value change at specified points.

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Final Cut Pro User Guide for Mac

Change a clip’s opacity in Final Cut Pro for Mac