When searching for "unblock YouTube," you will likely stumble upon hundreds of "free proxy sites." Be very careful with these.
If you are using Google Chrome, you can install extensions specifically designed to unblock videos. YouTube Unblocked: 11 Ways to Access Blocked Videos unblock youtube co
This is a classic workaround that sometimes works for network blocks (like at a school library) that aren't very sophisticated. When searching for "unblock YouTube," you will likely