Record a clip using the Xbox ones DVR functionality. Make sure your video is shared publicly on your xbox live feed, then go to "
https://xboxdvr.com".
Once there, search for your gamertag. Select the option for "clips", and find the clip you wish to share. Click on it, and there will be a box directly under the video with the link. Copy and paste that where you need.
It can also be used to link videos on here as well
(Sorry to post a dirt rally video in this section GTP staff, its the only video I have on my xbox feed to use as an example)