Amanda Conway (Youtube policy associate) posted on Youtube's blog about a face blurring feature that was released on the 18th of July. The feature allows for the blurring of faces on a video being uploaded Youtube.
The obvious target of the feature would be those involved in protests and want to keep their anonymity. Even in the blog post it's clear that they see this as initial use of the feature, the video featured in the blog uses a 'Demonstration in Egpyt' video to show how the blurring effect works. However, it can be used wherever a person wants to protect the anonymity in a video posted to Youtube.