rotoscopingro‧to‧scop‧ing /ˈreʊtəˌskəʊpɪŋ $ ˈroʊtəˌskoʊ-/ noun [uncountable] 
a way of making an animated film, in which someone draws over filmed images of a real person, animal etc performing actions
a way of making an animated film, in which someone draws over filmed images of a real person, animal etc performing actions