YouTube embedded video: set different thumbnail

Question

I want to embed a video from YouTube that is not mine (so I can not change it at YouTube). The video has a thumbnail that is not representative for the video (I refer to the

Answer 1

The answers did not work for me. Maybe they were outdated.

Anyway, found this website, which does all the job for you, and even prevent you from needing to read the unclear-as-usual google documentation: http://www.classynemesis.com/projects/ytembed/