This is a very good video rendition of pencil drawings of Yang Chengfu, set in the sequence of the Yang Style 108. Notice how the reverent master is solidly rooted and comfortably stretched in his posture. Study this video for your learning, and compare it with videos of other T'ai Chi practitioners.
Grand Master Chen Man Ching performs a tai chi short form and does some push hands. This video is vintage so occasionally there are some jumps and stutters in the action. Through modern day restoration techniques over the last several years the video quality has improved greatly.