Fix for [#34182] Movie Distortion and Bilateral Blur doesn't work together

 * added area of interest based on a radius around the input tile.
If someone can implement a correct formula (based on K1, K2 and K3) and send it to me, I will be happy to apply it!

 - At Mind -


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54600 954f8c5b-7b00-dc11-b283-0030488c597c