Rostoscoping isan animation technique in which animators trace over footage.The technique was inveneted  by Max fleischer whiles he used it in his series he started araound 1917.
Fleischer used rotoscoping in a number of his later carttons,most notably thE Cab Calloway dance routine in three betty boop cartoon from 1930s,he has animated all sort different things that was animated by Gulliver by the end of 1939.

Ralph Bakshi used the technique quite extensively in his animated movies Wizzardsin 1977 and alson he made all other different one in different years.Bakshi first turned to rotoscoping because he was refused by 20th century fox for a $50,000 budget increase to finish Wizards,and thus had to resort to the rotoscope technique to finish the battle sequences.

While rotoscoping is generally k nown to bring a sense of relism to large budget animated films,the American animation company filmatio.