I'm working in a personal project placing a gimbal over my car roof to record personal videos. I have been tuning up my DYS Smart gimbal and the first video shown a lot of vibration. The test was recorded with a GoPro Hero 4 camera.

https://youtu.be/yeJrWbaohZI

Any ideas? How can I reduce the vibration?

Thanks in advance.

EDIT: DYS Marcia photo ( http://www.hobbyking.com/hobbyking/store/catalog/52136.jpg )