Let's say you've uploaded a video to YouTube only to find that you accidentally left your phone number on full display to the world. If you wanted to avoid an avalanche of unwanted phone calls, you'd have to delete it entirely plus edit and upload the video all over again. Fortunately, as of today, that's no longer necessary. YouTube has just announced a new custom blurring tool that lets creators blur any object in the video right within the YouTube interface. You could use this to hide everything from license plates to brand names to a person's naughty bits.