Hipstamatic can’t reach your camera. In your iPhone’s Settings, tap Apps, then Hipstamatic, and turn on Camera. Still black? Close Hipstamatic and open it again.
Hipstamatic · 9.1 · 3 stepsCamera access is off, or another app is using the camera.

In your iPhone’s Settings app.
Swipe up from the bottom and pause, swipe Hipstamatic away, then open it.