Start Blender 3D version 2.5 or higher.
At the top, choose File from the menu and then User Preferences … or press keys Ctrl+Alt+U.
See the picture below:

Click the button Install Add-on …

A dialog will appear and you can select the script with that addon.
In this case his named free-tutorials2.org.

The script will be found in the User Preferences window on Camera Add-Ons section.
See image:

Let’s talk now about the script:

The source code does not have too many issues that can not be understood.
It is divided into three main parts: the first addon declaration, the second is to declare the two classes and a third room for registration.
The source code is not complete. It is made only for illustration.
It is good to read and on this wiki
The GUI result is shown in the next image.

I will return with a more complex tutorial on this topic.

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