Machinima are movies made with images from game engines. The word is supposed to be a portmanteau of "Machine" and "Cinema", but the guy who coined the term misspelled it. Since he misspelled it while coding machinima.com, the term stuck.
Since Machinima is a form of scripted video narrative, it could employ any of the Tropes from the main list, and there are also tropes specific to the medium. [...] [tvtropes.org]