[Plugin: NGG Video Extend] How to Watermark video thumbnail

Hiya, apologies for the very late reply! This is something that Shadowbox JS would encompass and in my initial search for a solution, I haven’t yet found one so I don’t know if this is possible.
I have asked on the Shadowbox JS forums so I’ll see what they say and get back to you.
I do know, however, that different players have different UIs so it’s possible that one of them has the large “play” icon in the middle.