How to show video clips in SL?

I have met people in SL every friday and learned a lot. Discussions and travelling (teleporting) together with other avatars are interesting. Also many seminars have opened many new routes for me developing skills and thinking. Yet, some very basic SL-skills are still missing. For example, I have not yet managed to show video clips in SL, just used some my outside links (Youtube etc.). Too busy, should slow down a little?