Video accidentally sent to the wrong person on iPhone

I sent a video to the wrong person, and while it was loading with the blue bar, I deleted it, but once it loaded it appeared in the conversation and I pressed unsend but I want to know what appeared on the other person screen because he just put "LOL all good", but I want to know what he saw or what appeared on his screen.?

[Re-Titled by Moderator]

Original Title: Video by mistake!