I also found many youtube videos that show greenscreen like button animations. What are these for, are they relevant to my issue? How to use them in shotcut?
First you would need to download that video.
Then you would need to add a second track in sc…
Then, import that video, mark the in/out points of the section you want and add it to the second track (with composite toggled ON), select it and use the Chrome Key filter to get rid of the green background.