To copy and paste a video thumbnail into an email simple visit the video info page and click the blue "SHARE AND SEND" button.
Then visit your email program of choice and paste into the body of your email.
Don't forget including the word "video" increase your click-thru rates dramatically!
Good news! This works with NEARLY ALL MAJOR EMAIL PROGRAMS! If you have issues with this try the COPY HTML option with the dropdown menu on the Copy for Email button.