The Unite Gallery is all in one image and video gallery for WordPress. It's based on the unite gallery javscript version, and has a very powerfull and intuitive wordpess admin for your ease of use. Every gallery option has it's description, devided into logical sections, and the items manager is very intuitive windows explorer style. Yet this gallery is very powerfull, fast and has the most of nowdays must have features like responsiveness, touch enabled and even zoom feature, it's unique effect.
(Buy premium account for maximum speed and resumming ability)