Create a Video

Hi, I want video for my app page in the App Store. This is the link of my app in the app store: [login to view URL] (It's a translator and dictionary app for arabic languages) Apple allows a 30 seconds video about the app. I need one video but it should be built for 4 different screen resolutions: iPhone 5, iPhone 6, iPhone 6+ and iPad it's necessary to have at least one iPhone and Mac. iMovie app and Quicktime are very helpful to create the videos. I can record raw videos for other devices and you can edit them. But having one device is necessary. After each major update of my app, we will create new videos. Please provide your quote for this project. As I said, in the end I need 4 videos, but all of them will be same except they are recorded with different devices and have different screen resolutions. Please show some of your past experiences in making videos. Feel free to ask any questions. Regards, Hadi