Doesn't work help me

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Dear the more able people (the whole world) ,
I've been sitten on this problem for days, but it still doesn't work...
Actually it's an easy problem. I' trying save an video bout dancing, using anything I found, save-video-plugins, some programs and even rtmpdumb. At the last one I don't know how to operate this. (yes, I've read tutorials, but those didn't helped much)
Could someone teach me how to do it, please? Using this video for example, http://www.getthedance.com/course/vi...nge-trennungen ,or any other videos on this page.