Как создать видео, используя блоки из нескольких видео (front-end)

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ello, I am creating an education platform that creates depending on the user choices a random class. I am organizing the class divided into blocks of 5 min with some categories in it, depending on the user choices the platform create grabs the corresponding blocks and create the custom teaching class.

My current situation is that I am using FFMPEG and a Python library to create new videos giving the path of the videos, adding some text etc.. This process takes place in back-end What I am trying to achieve is to make it with front-end and then the user can download this custom teaching class.

HTTP://underdogapp.com makes this on yoga, and so far I know they do it front-end way. Any suggestions?

Что я уже пробовал:

Попытка использовать фреймворки python, но этот процесс происходит на бэк-энде

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