Oh, I see, that does make a difference.
What kind of relationship do you have with the partner websites?
I wouldn't remove the pages. Can you archive all of the videos into one page, create a video sitemap, redirect all the existing URLs to that central archive, and then add a Hero video or slideshow at the top encouraging visitors to check out the new content? If you're still getting traffic from customers to those pages, the main thing is conversion and getting them into someplace valuable for them and you.
UPDATE: just read in another comment that you're getting rid of all videos on the site. That's an inhouse decision but I must say if you abandon all of these pages don't sacrifice the link juice, at least redirect the URLs to the homepage.