Magic Music Visuals

Magic question. I made an example because I tried to use the project on OBS but I would have the same problem in any other software. Basically, I need to understand how I can remove the background from the project. Thank you

Hi to everyone, I need help with this project: I need to use it but when I insert it into OBS, the background remains black and I can't remove it, what can I do? This is the project https://youtu.be/00gxQJKHEO0

Thank you