This technique can introduce everyday objects into 3d fractal animations.
REMBG was used to remove backgrounds from Creative Commons licensed clips. (thanks contrast_) Best to use clear backgrounds like planes and birds. Save as a PNG series of layers.
Make fractal 3d video stream. Use G'MIC or GEGL to lift a top layer of the fractal stream with a clear background. G'MIC Slice luminosity and Joan Rakes Neon Alpha can do this. Both streams are saved as a PNG series.
Now there are 3 PNG streams. They need to be the same number of frames to use ofnuts Interleave Layers.
Interleave the REMBG stream onto the fractal base stream.
Apply the top neon or highlights stream with Interleave layers.
This technique means that almost all editing is done with Gimp and the video editor is only used for clip fades.
I don't know how to get a fade in on a series of layers in Gimp other than using a video editor and bringing the series back in to Gimp.
The big birds are royal albatross from NZ and North American and Tasmanian eagles. The albatross are being wiped-out by plastic in the ocean.