This post has #kdenlive tag. AFAIK it is a desktop-only application.
@moreeni To the best of your knowledge, does Kdenlive currently have an effect that can remove backgrounds?
https://docs.kdenlive.org/en/effects_and_filters/lists/video_effects_list.html
@moreeni The closes Kdenlive has is the "Backgroundkey" effect.
https://docs.kdenlive.org/en/effects_and_filters/video_effects/misc/backgroundkey.html
@moreeni The "Backgroundkey" effect turns a static background color into transparency, essentially creating a chroma key effect. This is NOT the effect that is used in the video.