Simple DIY tilt gimbal for 250 class quadcopter

4 servo arms, 1 small length of carbon fiber rod, 1 small length of wire, 1 5g servo, hot glue. MassiveAcro (Naze32 equivalent) flight controller running Cleanflight. Just mount your camera in a way that allows it to swing. Either make a hinge (like I did with spare servo arms) or buy a hinge. Then attach a servo to the camera via a pushrod. Carbon rod or piano wire works well. Heck, even a paperclip could be used. Then enable CAMSTAB in cleanflight. You will have to move your motor plugs from pins 1-4 to pins 2-6 as now pins 1 and 2 will be used for servos. Plug in your servo. Make sure you assign a switch in your "MODES" tab to CAMSTAB so that you can turn it on/off. Enjoy your new pitch-stabilized camera.
Don't forget to move all your motors to pins 3-6. Plug your servo into pin 1 (where your throttle used to be).
CLI variables:
"mixer quadx"
"feature SERVO_TILT"
"set gimbal_flags=1"
In the Auxiliary Configuration tab setup a switch for the CAMSTAB mode.
In the Servos tab you can change the rate of the servo. In this video the servo rate is %60 pitch.