After registration of this script to your GIMP installation
you find a new menue entry at: File->Create->Misc
This script is a beta version, feel free to correct errors ;-)
I already applied a tilt shift effect to one of my movies:
First I extracted single pictures of the movie:
mplayer -nosound -vo jpeg MY_MOVIE.MOV
Then I run the gimp script. This took quite long, because mplayer extracted about 3k of pictures.
When the scripts was finished I added all single pictures together to a new movie:
mencoder mf://*.jpg -mf w=800:h=600:fps=25:type=jpg -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell -oac copy -o output.avi
Here you can see the resulting video :
