user1533: 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.

user26178: 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.

1533: <p>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 </p>

<p>(btw this is called masking right?).</p>

<p>Is there any simple opensource(or just free) software for doing this? </p>

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

<p>A good tutorial would be helpful as well.</p>
 26178: <p>An oldie question, but let's add an answer...</p>

<p>The answer depends on if the faces are moving through the frame.</p>

<p>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.</p>

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

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

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