How do I overlay an image onto video

Hello
I found a tip on how to create a mask in Photoshop, then overlay it onto iMovie. But the example video was so small I could not follow it.
My requirement is that I shoot video of say a computer screen, then I want to make a blurred out portion of the screen image in Photoshop, then overlay it back onto the video footage. I want to do this to blur out any private information, for example a username or password.
Can anyone help, please?

I want to do this to blur out any private information, for example a username or password.
With iMovie, I would normally do this as a post edit in QT Pro. Simply create your "mask" and layer it over the information you wish to protect. By using the "Add to Selection & Scale" option, you can then set the proper duration automatically, as well as, set the location to "cover" the exact area needed. Would assume this might also be possible in iMovie, but would require a PNG with "Alpha" channel to be dropped on your original clip and then manually adjusting the duration and would still likely require QT Pro to set the proper alpha-channel "mask" option later. Assume ther may be other ways to do this.

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