EDIT THE UPLOADED SOURCE VIDEO. Replace ONLY the background with a…

EDIT THE UPLOADED SOURCE VIDEO. Replace ONLY the background with a highly photorealistic, lively Manhattan street in New York City during daytime. The person must appear naturally standing on the sidewalk, presenting information from the laptop held in their hands. Behind the person, realistic pedestrians walk continuously, yellow NYC taxis and other vehicles move naturally, and the city feels busy and alive. The background must show consistent natural motion throughout the entire clip, with realistic depth, scale, lighting, shadows, and perspective. CRITICAL FOREGROUND PRESERVATION: The original person, hands, fingers, clothing, face, hair, body, gestures, movements, position, and timing must remain unchanged. The laptop must remain EXACTLY as in the source video, including its physical appearance, position, screen, presentation, every letter, number, graphic, color, slide, and transition. Treat the laptop screen as a protected, immutable part of the original footage. Do not regenerate, redraw, reinterpret, enhance, blur, replace, crop, or modify even a single pixel of the presentation. Preserve the original camera framing, movement, voice, speech, and lip synchronization. Add only quiet, natural New York street ambience: distant cars, subtle footsteps and soft crowd chatter, at a low level beneath the original voice. No loud honking, music, artificial sounds, flickering, CGI appearance, subject deformation, changing text, or altered screen content. ONLY THE BACKGROUND AND SUBTLE BACKGROUND AMBIENCE MAY CHANGE. Prioritize documentary-level photorealism and continuity.