user5299: So I am using my camera to make vlogs for youtube and sometimes interview people. I have a background that doesn't move and I have a person in front of the camera who sometimes moves from left to right.
My camera already has a subtle depth-of-field, but I want to make it more noticeable. Now I know that photobooth in OS X has a trick where you step out of the frame for a moment and then when you step into the frame it can separate you from the background. I guess FCPX can probably do the same trick, but I haven't found that feature yet. Is it in there? Can I use it to create the effect that I want to create?

user5296: FCPX can't do this automatically (like Photo Booth) unless the background is a single colour.
As a workaround, if possible…

Take a picture of the background.
Film the vlog in front of a green screen.
Key the background leaving the alpha channel.
Place the picture behind the video layer.

There is a full guide in this Apple KB article:

Final Cut Pro X: Use chroma keys


5299: <p>So I am using my camera to make vlogs for youtube and sometimes interview people. I have a background that doesn't move and I have a person in front of the camera who sometimes moves from left to right.</p>

<p>My camera already has a subtle depth-of-field, but I want to make it more noticeable. Now I know that photobooth in OS X has a trick where you step out of the frame for a moment and then when you step into the frame it can separate you from the background. I guess FCPX can probably do the same trick, but I haven't found that feature yet. Is it in there? Can I use it to create the effect that I want to create?</p>
 5296: <p><strong>FCPX can't do this automatically (like Photo Booth) unless the background is a single colour.</strong></p>

<p>As a workaround, if possible…</p>

<ol>
<li>Take a picture of the background.</li>
<li>Film the vlog in front of a green screen.</li>
<li>Key the background leaving the alpha channel.</li>
<li>Place the picture behind the video layer.</li>
</ol>

<p>There is a full guide in this Apple KB article:</p>

<ul>
<li><a href="http://support.apple.com/kb/PH12665" rel="nofollow">Final Cut Pro X: Use chroma keys</a></li>
</ul>
