Search Videos with the new “People in videos” column in SharePoint 2013
A new Column “People in videos” of Video Content type has been Introduced where you can specify people who are in the Video to be included in Video Metadata.The column is available when you edit the properties of your Video that you uploaded in Site Asserts library.
if you enter someones name in the site Search box and select the scope “Videos”, you will find all videos where this person was added in “People in videos” column.It looks like a facebook Photo tagging fetaure.