Adding youtube video tutorial of using the graphic products

I know how to add youtube video. But, many author uses Screenshot of youtueb video and add the video link with the screenshot. The URL of screenshot is likt this-https://camo.envatousercontent.com/. Please, can anyone tell me how to do it? What is the location actually?

your link does not work

Yes, this link shows ‘go-camo’. But, I saw this link to the image, that the authors are using for keeping their screenshot. My question is that, about the link.

Ou. Do I understand you correct? You ask where to find the screenshots of the video? If yes, here: