Almost all the contextual platform allow you to embed a video I think. Just place the video in your article and choose each contextual platform and wait till the verifies start coming in and check the live link and see if your video works.
Just need to test it like that and you'll know for sure.
Comments
Example....
<object width="560" height="315"><param name="movie" value="//www.youtube.com/v/sSSPTewv5jo?version=3&hl=en_US&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="//www.youtube.com/v/sSSPTewv5jo?version=3&hl=en_US&rel=0" type="application/x-shockwave-flash" width="560" height="315" allowscriptaccess="always" allowfullscreen="true"></embed></object>