YouTube has added a new face blurring feature that allows you to blurs faces in your videos automatically. It works well enough that it will even blur pictures, posters and hand drawn smiley faces. Check out the video below:
Blurring faces on YouTube is simple. Once you’ve chosen the video that you’d like to edit within our Video Enhancements tool, go to Additional Features and click the "Apply" button below Blur All Faces. Before you publish, you will see a preview of what your video will look like with faces blurred. When you save the changes to your video, a new copy is created with the blurred faces. You will then be given the option to delete the original video.