1. Open swift video editing software, and click the character key button to enter the character key interface.

2. Click the "Add" button or drag it directly into the video to import the material that needs character keying.

3. Click Add Background to change the video background to further achieve the video effect you want. The software comes with its own background template, and also supports custom background.

4. Change the soundtrack to make the video more stylish. You can choose to recommend music clips provided by the system, or you can upload and add them yourself.

5. Set the export parameters, and then click Export Video to finish.