Many companies/universities puts restriction on youtube.com on their network, So people can't play vidoes from youtube.
Search the video you want to play in Google
Now look at the url of the first video, copy the part of url that is appear after 'v='. In this image that part is
Now open this url in new tab and concat that copied url part. Final url will be
https://www.youtube-nocookie.com/embed/-5wpm-gesOY, press enter and play.
Using this method you can play videos from youtube.
Some videos are restricted from playback on certain sites or applications, so you may face problem with them. You can't play videos from vevo channels.