Mahmut uses an LTE shield to supply 4G access to the onboard Raspberry Pi and Camera Module. Then, using the image he supplies here, you’re good to go.
If you want to make your own Pi-powered drone, you’ll find Greg Nichols’s step-by-step guide for building one here. Greg uses a Pi Zero and the total cost comes in under $200.
The small, lightweight nature of the Raspberry Pi makes it perfect for drone building. If you’ve made your own, we’d love to see it in the comments below.