You would need to build an equatorial tracking platform. Needs to be fairly precision build - for an 8 inch you would be better off buying an Heq5 and have all the computer control features. Astronomy is not the best hobby to be in if you do not want to spend money
http://www.equatorialplatforms.com/
Theer is plenty of information on the wenb onb how to build them but they are best just for visual observing . It would be cheaper and easier to experiment with some kind of field derotation device to rotate your camera.