How to make this or similar effect in FFMPEG?

Question

Video

How to make such video blur effect using ffmpeg?

Examples:

video before processing

video after processing

Need the same effect as in the second video, how to do it in ffmpeg? So that the picture in the video is blurred like in a video with a swirling effect.

Answer 1

It seems to me that this is not a radial blur, but a multiple copy of the layer with an increase in small steps, blur and overlay. If you look at the video of the result, you can see the discreteness of the steps of the parts. The split
filter decomposes the input into, say, 20 outputs. Each is enlarged by cropping the edges with the crop filter ; blur the boxblur and overlay with a normal overlay or better blend with "overlay", "softlight" or "bleach" mode or others - you have to experiment.

Answer 2

https://patchwork.ffmpeg.org/project/ffmpeg/patch/...
There were no similar filters in ffmpeg, but there seems to be a patch that adds radial blur. Unfortunately, it did not get into the main branch, but you can try to build ffmpeg with this patch from the sources.