This website called safe TV allows you to generate a safe link which you can then embed into your your point, on your blog, use on your interactive whiteboard.
The site removes all adds from the you tube clip and most importantly it stops the recommended videos from appearing at the end. These recommended videos which appear on you tube after you video had finished can be inappropriate and not something that you can control. Well now you can. It also removes all the comments that others have posted about the video some of which can be very inappropriate for students.
This is a great site to bookmark