Blur Faces with Built in YouTube Video Enhancement Tools
Video Filters to improve your videos,
Auto-fix for Automatic color correction,
Fine Tune for Manual color correction,
Stabilize to Remove shaky camera motions,
and the YouTube video editor for combining multiple videos.
Apart from this basic video enhancement features you can see additional features button this will allows you to blur all the faces in the selected video, the following are the step to Blur all the faces in your YouTube video.