Crash course for using youtube videos as channel content?

Hello. We have created a roku channel. We lack launch content. We have identified more than 400 videos from youtube that will help populate this channel.

Does anyone know if its possible to lease access to youtube videos?

We have every aspect of the channel created including video hosting and design.

Youtube has many key videos that we would like to offer.

I see no clear-cut purchase method for these videos other than contacting every single publisher.

Feedback is appreciated