Creating animation on a transparent background in Blender 4.
In the render settings (Render Properties) we find the item "Film"
and put a tick in the "Transparent" checkbox
further, in the output settings (Output Properties)
determine the path to save the final file from:\
select the output file format (File Format) "FFmpeg Video"
and go to the encoding section
in the drop-down menu container (Container) set "Quick Time"
and in the video settings set the video codec (Video Codec) "QT rle / QT Animation"
after that in the file format settings (File Format) in the color section (Color)
we will have an alpha channel (the same background transparency) and select it by clicking on the RGBA button
after that we send everything for rendering
Upon completion, overlay the video in any video editor.