Another use is to apply an effect such as blur or pixellation to only part of a video picture.

You put a copy of the clip on a track above itself.

Apply blur/pixel/black & white - whichever effect you want, to the lower clip

You use the cookie cutter on the top clip to make a "hole" through which the effect you applied will show through.

Good for "disguising" faces.

Keyframing can be used to move the "hole" around or resize it if the "face" or whatever moves.

You can have several separate cookie cutters applied to the same clip.

yet another dumb question,...is frame by frame THE only way to apply cookie cutter(blur) a moving target???

If the person moves forward at a reasonably consistent rate of speed, you should only need a starting position and ending position keyframe. But, yes, you will probably need several keyframes (just not one for EVERY frame)

Here's how I go about it:

First disable the bottom clip (Right click > Switches > Disable).

This is just a temporary measure which makes the "hole" show as black, and therefore is much easier to see where it is.

Open the Cookie cutter on the top clip and click Sync Cursor.

Establish the initial "hole" shape, size and position.

Click ahead say 2 sec and see if the hole is still in an ok position. If it is, do nothing, if it isn't, move it to where you want it. A Keyframe will automatically be created.

Check halfway between this new keyframe and the first. to make sure that the intermediate position is also ok. If not, adjust.

Repeat this procedure for every 2, maybe 5 seconds - depends on how much movement you are dealing with.

When you've finished, play the clip and make sure the black hole is where you want it throughout. If not, stop and adjust

Now re-enable the bottom clip and you're done.

It would be great if SOFO created roto-splines or bezier splines for use as a cookie cutter! It is the only thing lacking in Vegas for compositing / keying and SFX work

I love the cookie cutter. My favorite tool!

KK! Homemade Cookies ARE THE best - so it's "KK loves CC for VV!!"

Grazie

AZEdit:
TOTALLY with you there!!!!!!!
We've been craving here for a Rotoscopy application that would allow that, among other possibilities (like creating precise masks).
Satish is currently working on such an app. Hopefully, it will lead to something one of these days... :)

futZ,
It would be great to have the capability! I really miss roto splines when creating precise mattes and traveling mattes! Satish has been doing some great thing for Vegas Users- Thanks for your hard work and efforts!!! Maybe we can take up a collection to get Satish-splines!!! :)

The plugin is on the way and coming out very good...

Great news, Satish! Thanks for being a resource for all Vegas users.