Here is a kit that lets you upgrade your drone and control camera movement in the air easily. With Vertical 1, you can control your camera angles without having to spend a ton of money on a new drone. Bring your tablet to tap on any subject during flight to keep the camera focused on it.
Vertical 1 is easy to install, rugged, and lightweight. It is compatible with DJI, 3DR and Freefly drones. More information is available here.