On your Windows Phone, go to Pictures, find your video, press and hold it, and then choose
Share on SkyDrive. (If the option to share on SkyDrive doesn't appear on your phone, tap Pictures, tap More, tap Settings, tap Quick Share Account, and then select SkyDrive.) SkyDrive is a free online service for storing and sharing files. After you've uploaded your video to SkyDrive, you can get to it from any online PC or laptop by signing in to your SkyDrive account.
You can also use SkyDrive to share the video with someone else. Just go online on your PC or laptop, go to the SkyDrive directory the video is in, and click Share folder. Then, in the Add additional people box, type the name of the person you want to share with. If you've got that person in your contact list, their name will pop up as soon as you start typing. If you want, SkyDrive will also send that person an email from you to tell them the video is available.