Is there an app that lets you put a picture on a video?

Well I just started a YouTube channel. For tutorials, vlogs, hauls, music, ect. And it would be awesome if you could check it out, and leave a like or maybe even subscribe! I love being behind a camera and filming so I would really love you! It is mostly for teens and pre-teens 11-16 (I'm 14) but anyone can be one of my little Alygators! I will try to make a vid every week.
The channel name is AlygatorTutorials, so just google that: D Anyways enough adv. My question is. Is there an iphone app that lets you put a picture on a video while the video is still playing? I have the video edited, all I need is to put the pictures on.

Hi, I don't think so but you can add a picture on a video with windows movie marker
anyway, You re doing fine, you only need time, I would like to recommend you:
1.-Promote your channel with a twitter, facebook or goggle + account around the world
2.- make HD Videos or HQ videos
3.- more tags and a better description name video in all your videos
4.- subscribe a lot and make alot of YT friends around the world
5.-Post more comments in other videos similar like yours

btw, If you want a new subscriber, You can answer my youtube message.
I always do what I promise
I'm always on youtube!