It's only for a few seconds but this is a clip from Klitschko's first day of sparring, this footage is against Izu Ugonoh - spot KB ringside
https://www.youtube.com/watch?v=JigoCqZwQN4&feature=youtu.be
https://www.youtube.com/watch?v=JigoCqZwQN4&feature=youtu.be