Wu, through the Eddie Wu lineage, has a beginner form, and it's kind of a "stick figure" form.
But in my experience, in general, teachers vary the way they teach beginners quite a bit. However, Chen is likely to be a bit more precise in its sets, with less variation. Yang might have the most variation, partly because it's the most common.
The type and quality of Tai Chi we learn is extremely dependent on the teacher and organization. About the only thing that is (for the most part) consistent between teachers is that the movements they teach look sort of like slow motion Kung Fu.
The inconsistency is vast, so the idea of "learning Tai Chi" has limited meaning.
As for videos, there are a ton of them out there, and also (it seems) just as many MartialTalk threads on how one should not learn Tai Chi from a video.