A brushless motor gimbal is the only way to really get a smooth filming platform

 

www.goodluckbuy.com/aluminum-brushless-camera-mount-gimbal-kit-w-motors-and-gimbal-controller-for-compact-camera-aerial-photography.html

www.unmannedtechshop.co.uk/2-axis-brushless-gimbal-controller.html

desirerc.co.uk/index.php?option=com_jcommerce&pgn=product_info&products_id=105

www.rctimer.com/product_950.html