Here is a few videos for guitar lesson for beginners:
First, you must know how to tune a guitar:
How to tune a guitar
Tuning a guitar
And then, you can watch those videos to learn to play chords, here is a few videos:
This first video, is from Justin (www.justinguitar.com) with great free guitar lessons.
Beginning Gutar 101
Of course, you can make your own search on Youtube. Just write " Guitar lessons for beginners" in the search box on Youtube. There are many many lesson from different sources over there, you should check it out.