You do this by clicking the same "Pin It" button you have installed in your bookmarks bar whenever you see a video. Example, when you see a YouTube video that you want to pin, just click on the “Pin It” button on your bookmarks toolbar like what you did on the previous image, then a pop up window will appear. See the images below:
Choose the video that you want to pin by clicking the “Pin This” button on the center of the video. Once you’ve click on the but-ton, another pop up box will appear just like the pop up box when we pin an image then just click the red “Pin It” button.
After clicking on the “Pin It” button, another pop up box will ap-pear where you can choose to “See your Pin” or “Tweet your Pin”.