[SFM Tutorial] - How to show a video inside a video! 

First of all, excuse me for the poor quality of the video. I don't know why, when I import the videos into Sony Vegas their framerates are divided by two... I will change my capture software in the future, but I've recorded this 5 times and I don't want to start it from the beginning...
Just a quick tutorial about how to show a video or animated image inside a SFM video. In this example, I'm showing a tank moving inside a computer screen. The audio is on Spanish, but I added English subtitles so anybody could understand it.
I'm using this technique on my next video, and I was going to do this tutorial after I published it, but, this week is the tutorial week of the Open Source Filmmaker community, so I decided to do it now. Sorry for not adding the official OSFM logo, I realized I hadn't added it after it rendered...
Please report if there is any problem with the video. If I wrote something wrong, please say, but don't expect for me to change it unless it is a very important mistake.