IgorBeg has already made many useful videotutorials with explanations in English. Now he has brought together all the HowTos and makes them available to anyone interested. I recommend you to look at his site because many nice things. In addition there is now a section on Cinelerra-GG Infinity where you can find all its tutorials. The tutorials are on advanced topics and covered in depth; their usefulness is really high for those who want to learn how to use Cinelerra-GG. I recommend downloading the videos locally so you dont have problems slowing down.
Website: The Art Gallery of Monica Beghetto & Igor's Portfolio
videotutorials: Igor's Portfolio