1. A gesture recognition apparatus comprising: a first detector configured to detect a detection area including a portion of a body of an operator in a first image of a motion image captured at a first resolution; a second detector configured to detect an auxiliary area including an auxiliary portion used for detecting the portion in a second image of the motion image captured at the first resolution when the detection area cannot be detected; a controller configured to control, when the auxiliary area is detected, to cause a capturing unit to capture a third image of the motion image captured at a second resolution higher than the first resolution; a third detector configured to detect the detection area in the third image based on a predetermined positional relationship between the detection area and the auxiliary area; and a gesture recognizer configured to recognize a gesture of the portion based on an entire area of the first image or the detection area of the third image.