It is always good to contact the tower when attempting to do a project like this! They have insight, and knowledge which you don't, and when you think, c'mon, it's only 5 minutes, what harm could I do? That's when unintended accidents happen, which may cause damage or death, which you fully didn't intend, but are now responsible for, all for 5 minutes! I am speaking from experience, I was a military controller for a number of years, and only allowed hobbyists, ( fellow soldiers) to use the airfield on weekends, in Germany, where flying was prohibited, unless you were a glider! During operational hours, I had helicopters, and fixed wing aircraft transitioning thru my airspace, and had to be on top of my flight following! Fixed wing, Traffic included fast movers, A-10's, British Tornadoes, F-16s, my heli traffic OH-58, OH-58D, AH-64, UH-60, CH-47, CH-HH-53's........and I didn't have time to worry about some smuck wanting to take a picture for his pleasure! If you contacted me, first thing, I could designate an area for your flight, and have aircraft avoid the area, because I had knowledge, therefore, the aircraft had knowledge, hence , no accidents, cause we were all on the same sheet of music! Imagine scanning your areas and looking at your reporting points, and seeing full size aircraft where they are supposed to be, but can't see a tiny drone in time to warn of an impending collision!