With the advent of YouTube you can view just about everything from that site. The selection can be overwhelming. I have arranged a selection here that mixes tai chi history, documentary, and instructional pieces. How many times have you been looking for a certain topic and surfed so far away from the original search that you begin watching cats play the piano?
Here is a video on Zhang San Feng. Many think he was the originator of Tai Chi. Even if he wasn’t he was integral in it’s popularity.
A brief history of Tai Chi.
This is a documentary on the interaction of the Tao and Martial Arts. It is a definite “must see”.