2. Then click Add Video.
3. Then double-click the video whose background we want to change.
4. Then click the picture style in the upper right corner of the screen.
5. Then choose the background we want.
6. Finally, click OK to modify it.
7. Before changing the video background, you need to prepare a short portrait with a green screen or a blue screen, and prepare a clear picture with high resolution, so that you can see the effect after fusion.