How to get image from YouTube Video
YouTube is a video-sharing website headquartered in San Bruno, California. The service was created by three former PayPal employees in February 2005. In November 2006, it was bought by Google for US$1.65 billion. YouTube now operates as a Google subsidiary.
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To get image from youtube video just change the YouTube video ID on below URL

Code: 
http://i.ytimg.com/vi/lL53VNgQx-g/0.jpg

Ex: YouTube Video URL
https://www.youtube.com/watch?v=lL53VNgQx-g
and than copy it to past on your Web browser.