I have a branch that detects faces and extracts vectors, it's just a matter of aggregating them and creating a UI so users can search for videos by face (or by dropping an image with a face).
Still a lot of work pending on user interface side, but this is definitely on the TODO list. We are also working to allow users to search for a lot more categories of objects in the upcoming releases.
It has been a lot of work, so thanks for feedback and checking out!