A word of caution - projects in topics like AI and big data sometimes end up being much larger than you thought at first. I would suggest that you find something achievable within the time you have. Besides teaching technical skills, capstone projects teach project management skills. I think you will find that future employers will be much more impressed with a well executed project than a technically impressive project that never got off the runway.
That doesn't mean you cant explore these topics... just find something that you are passionate about, and aggressively scope it down for the first pass. If you succeed, you can always make it larger!