Green Screen and Chroma Key
Import Footage: Import your green screen footage and the background footage you want to replace.

Create a New Sequence: Create a new sequence with both the green screen footage and the background footage on separate tracks.

Apply the Effect: Select the green screen footage and apply the Ultra Key effect.

Adjust Settings: Use the effect controls to fine-tune the keying process.

Refine the Mask: Use the matte controls to refine the edges of the keyed area.

Add Additional Effects: Apply color correction, sharpening, or other effects to the keyed footage.