<p>Something like that is solved with "Rotoscoping". After Effects has several features that make this process easier. F.e. the "Roto Brush", you can find a tutorial about that here:
<div class="youtube-embed"><div>
                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/IHz_UvZ5_8g?start=0"></iframe>
            </div></div>
<a href="https://helpx.adobe.com/after-effects/using/roto-brush-refine-matte.html" rel="nofollow">https://helpx.adobe.com/after-effects/using/roto-brush-refine-matte.html</a></p>

<p>Then you will have to track the translation and rotation of the sign as its carried around. When you have that you can add a layer that follows the movement of the sign that holds your new content.</p>

CC BY-SA 3.0
2015-11-14T13:47:21.177Z
2015-11-14T13:47:21.177Z
timonsku
<p>I need to change the sign contents in the <a href="https://www.youtube.com/watch?v=E2ZDpRwKaUA" rel="nofollow noreferrer">clip</a></p>

<p>The problem is that in some parts gets "blocked" by walking in front of it Minions. How would you solve this challenge?</p>

<p><strong>Screenshots:</strong></p>

<p><a href="https://i.sstatic.net/9UDgd.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/9UDgd.png" alt="enter image description here"></a>
<a href="https://i.sstatic.net/12oWb.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/12oWb.png" alt="enter image description here"></a></p>

<after-effects>
How to inserty custom background or second plan footage using dynamic mask in After Effects?
J.Olufsen
# How to inserty custom background or second plan footage using dynamic mask in After Effects?

(Asked by: username_0 on 2015-10-19)

I need to change the sign contents in the [clip](https://www.youtube.com/watch?v=E2ZDpRwKaUA)

The problem is that in some parts gets "blocked" by walking in front of it Minions. How would you solve this challenge?

**Screenshots:**

[![enter image description here](https://i.sstatic.net/9UDgd.png)](https://i.sstatic.net/9UDgd.png)
[![enter image description here](https://i.sstatic.net/12oWb.png)](https://i.sstatic.net/12oWb.png)

**Tags:** after-effects


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## 1 answers

### Answer by username_1 on 2015-11-14. Score: 1

Something like that is solved with "Rotoscoping". After Effects has several features that make this process easier. F.e. the "Roto Brush", you can find a tutorial about that here:<https://helpx.adobe.com/after-effects/using/roto-brush-refine-matte.html>

Then you will have to track the translation and rotation of the sign as its carried around. When you have that you can add a layer that follows the movement of the sign that holds your new content.


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