{"observation":{"id":"631adbe4-987c-49c8-95b9-fdfecc541070","tool":"kapwing","tool_name":"Kapwing","criterion":"motion-handling","criterion_name":"Motion handling","criterion_definition":"Does quality degrade when the subject moves quickly, gestures, or leans?","criterion_evidence_type":"transformation","criterion_rank_role":"decisive","criterion_rank_role_reason":"A video-background tool has to keep working when the subject moves; failure here means the core effect breaks down. (3 of 3 judges)","scenario":"indoor-talking-head","scenario_name":"Indoor Talking Head","group_tag":"remove-or-replace-video-backgrounds-using-ai","scenario_description":"An indoor talking-head video of a person speaking directly to the camera with a static background, natural hand gestures, and facial expressions. 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