Photology theme provide 4 kind fullscreen gallery that you can use, you need to create page by using page template with Slider prefix.
To create Fullscreen Gallery Page, just go to Pages→Add New and select template :
Fullscreen Gallery Page Template
Fullscreen Gallery Page Preview
On this section, you can mix image or video gallery, you can also have option to show thumbnail bellow the fullscreen image on Photology Fullscreen Media Option.