if the placement of the video on youtube, then you the usual vds enough.
and if you upload videos to your hosting, here is a video forces your server and heavy traffic ... and a lot of extra movements.
The resource-intensive will - convert video downloaded format web formats at different quality. And the width of the channel. For example, 100 people watching movie in HD quality.
so it is completely 2 different approach, both in cost and implementation.
I would advise to start with a cheap vds + fill on youtube and all.
taken from youtube for the sample taken www.youtube.com/watch?v=I41CX0RdmPQ
the video in 1080HD quality on 1 person to 15Мбит/s at the peak load
correctly noted that if we increase the channel up to 1TB/s then we'll hit the screws and stuff ....
so either on his website, only poor quality, or to give youtubу