I was wondering if there was a relatively simple way to blur out faces or anything else in videos using Quicktime Pro?
Well, in the quicktime, it may be possible by setting pixels or something, but it will not be simple, will take a lot of time.
you can use i-movie, after effect or some other software with the blurring capacity.
How to do it with quicktime :
you can hide the faces by
adding an image, or big text
May be you have seen on tv, the faces or any parts of videos have big images written "censored".
you find it difficult to see a video with a watermark, use that watermark,or subtitle or whatever you name it, just cover the part with them.
tell me if it helped or not.
Quicktime Pro does not have the capability to edit a movie in this way. You will have to use iMovie or another video editing tool to do it.
If the faces are static meaning they don't move but are always at the same screen position you could add an overlay at their positons.
If they are moving I suggest to get some pro tools like Final Cut Studio or some Avid solution which supports (motion) tracking maps. They will allow you to track the faces and add an overlay or blur to them.
Without tracking maps you will have to go every single second and every single frame to do it.