Display WordPress video when shared on Facebook

Hello,
I have a WordPress blog (http://Blog.DrJudiC.com) and some of my Youtube videos are added to my blog pieces. I was looking for a way that when someone shares the link the video is the image that shows on Facebook. I have found ways to get it to show the video as a featured image, but I want people to be able to see that it is a video. I’ve tried a number of plug nins but apparently I’m missing something. Last one was Open Graph protocol Thanks a mil!