gauss blur for Mac

From cf/x:

This iMovie plug-in can blur your clip using the 'gaussian' method of blurring (which looks more natural than other blur methods). However, our plug can do more than just blur your clip. It's features include:
* selectively blur only part of your clip
* independent values for horizontal and vertical blur!
* blur sizes from 5x5 to 50x50 pixels
* special, experimental finite-state machine algorithm (as if you cared...)


WARNING
Gauss blur algorithms are a proven method for humbling your processor(s), and are not suitable for people faint of heart. Although we use above mentioned experimental (read: cool) finite-state algorithm for blurring (which gives us a 2x-5x speed boost over more traditional algorithms), the plug-in is a CPU hog. so if you want to 50x50 gaussblur your mother-in-law from your half-hour wedding video, make sure have the time - or one of those super-clusters.

? what should I use it for?
use this plug-in whenever you need to ?unsharpen? (i.e. blur) a part of your clip, be it for special effects (for further post-production), soft horizontal or vertical motion blur, to protect the guilty, or to help focus other parts of your clip.