I love this App! It has so many fun styles to choose from and adds a little something extra to video. You can even add the effect to videos already on your phone! It films in HD and 16x9 ratio, which if you ever wanted to edit the clips, this is the best way to film with this app.
Here's a picture to get a better idea as to what this app does!
|ORIGINAL FILE 8mm APPLICATION|
For only $1.99 it's a steal. I've been using it for years. You can find it under a search for 8mm Vintage Camera in the app store.