addTracks(for:preferredStartingTrackID:)
Declaration
func addTracks(for cinematicAssetInfo: CNAssetInfo, preferredStartingTrackID: CMPersistentTrackID) -> CNCompositionInfofunc addTracks(for cinematicAssetInfo: CNAssetInfo, preferredStartingTrackID: CMPersistentTrackID) -> CNCompositionInfo