Our recommendation is that you have at least three videos uploaded before launching your site.
The first reason is that the video library fits six videos on each page. Having three videos is one full row and is visually pleasing.
The second reason is that three gives your client some perceived choice. If there were only one or two videos, there just isn't enough there to show value.
And the third, is that the number three has some spiritual and symbolic significance in many cultures and religions. It's just simply a powerful number.