Filter gblur
  Apply Gaussian Blur filter.
    slice threading supported
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
gblur AVOptions:
  sigma             <float>      ..FV..... set sigma (from 0 to 1024) (default 0.5)
  steps             <int>        ..FV..... set number of steps (from 1 to 6) (default 1)
  planes            <int>        ..FV..... set planes to filter (from 0 to 15) (default 15)
  sigmaV            <float>      ..FV..... set vertical sigma (from -1 to 1024) (default -1)

This filter has support for timeline through the 'enable' option.

