1. A method comprising: obtaining, by a computing device, an existing object detector used to detect a first object class; splitting, by the computing device, the existing object detector into portions, the portions of the object detector comprising a head portion, a torso potion and a tail portion, the torso potion of the object detector detecting stable object variations; generating, by the computing device, an adapted head portion for use in forming an adapted object detector, generation of the adapted head portion comprising retraining the head portion of the existing object detector; generating, by the computing device, an adapted tail portion for use in forming the adapted object detector, generation of the adapted tail portion comprising retraining the tail potion of the existing object detector; forming, by the computing device, the adapted object detector using the adapted head portion, the adapted tail portion and the torso portion, the adapted object detector comprising the adapted head portion generated by retraining the head portion of the existing object detector, the adapted tail portion generated by retraining the tail portion of the existing object detector, and the torso portion of the existing object detector as the torso portion of the adapted object detector; analyzing, by the computing device, a media content item using the adapted object detector to determine whether the media content item depicts a visual object belonging to a visual object class detected by the adapted object detector.