vcm.GBlur(clip [, int ksize = 5][,float sd = 1.5])
clip: input all formats except Compat.
ksize: Kernel size 3 to 11 odd number
sd: standard deviation allowed.
A separable Gaussian kernel of odd number size 3 to 11 is designed for blurring. For constant integer formats if ksize and sd combination become ineffictive to outer values of grid, an error message warns.