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I want to focus faces of an image and move that focus to each of the faces one by one with a delay.The other area of the image should be hidden/blurred

(btw this is called masking right?).

Is there any simple opensource(or just free) software for doing this?

A trial version would do because I need to make only one urgent video for now.

A good tutorial would be helpful as well.

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An oldie question, but let's add an answer...

The answer depends on if the faces are moving through the frame.

If the faces are relative still, like a camera on a tripod and the persons sitting in front of the camera, any video editor with more than 1 video channel can do the trick. Just add a layer with something on it, a prepared semi-transparent PNG as a mask perhaps.

But more complex software is needed if the faces are moving or if you want a blur, instead of a semi-transparent mask.

If the faces are moving you need to track them, so the program needs to track it.

As @Shultc commented Both Blender and HitFilm can do this, and I would add Davinci Resolve.

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  • Blender — Made for 3D, but can do video manipulations too. (open source, really hard)
  • HitFilm — Made for video. (have free version, easear)
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Since you state a trial version will do, Adobe CC Premiere Pro fits the bill. It's full featured and affordable after the trial license ends.

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