When you upload a video to YouTube, there is always the thought that you might been discovered, especially if you are doing something wrong or stupid! But now thanks to a cool new Face Blurring tool from YouTube, users will be able to blur out their faces or the faces of anyone else and thus preventing them from being identified. There are all sorts of possibilities some good and plenty that are bad, but that is for others to sort out!
Want to see it in action, this is how you can start to use the new face blurring technology to enhance your video uploads;
Log in to your YouTube account.
Click your username (located in the top right corner of any page) and select Video Manager.
On the right of the video you wish to edit, click the Edit button.
You’ll be taken to the edit info page for the video. Click Enhancements.
Select Additional Features.
Click the Apply button below Blur All Faces.
If you’re satisfied with the blurring as you see it in the preview, click Save As.
Source [YouTube Global Blog]