Another great tool that may help when using video content is tubechop. This tool is helpful when you find the perfect youtube video, but it is just too long. Shorter segments of videos are more successful than long videos. Tubechop allows you to chop the youtube video and save only the most relevant part.
If watching YouTube in your classroom makes you nervous due to the fact that you have no control over what may pop up on the side of the screen, Safeshare is your answer. Safeshare takes YouTube links and creates a "safe" link for them, which take out the risks of putting students in the YouTube environment.