From beginning to end? I don't know of any, but there are a handful of work-in-progress streams on Twitch.
You can start with the 3D modeling Twitch community https://www.twitch.tv/communities/3dmodeling
Pixologic does ZBrush streams throughout the week. You can check their schedule here (http://pixologic.com/zbrushlive/
) and here (https://www.twitch.tv/pixologic
) The presenters also stream on their own channels sometimes, and you can find the listing here: http://pixologic.com/zbrushlive/presenters/