How do I build an autonomous quad copter that can travel up to 90 mph and record video?

My company has asked me to come up with specs for a quad copter that can travel up to about 90 mph and record video. It will be used to take videos of prototype cars traveling at highway speed. I have never worked with these before so I fear that I am jumping into something an area that is much more complex than it looks at first sight. Did I mention that we want to make it autonomous? If not autonomous then at least FPV so we can be sure we are capturing good footage.