Video background changer — a new location, no green screen

Yes. Genjutsu's Change background mode works on ordinary footage: it keeps every person and foreground object with their motion and the camera move, and rebuilds the environment around them from your words or a reference photo. Because the scene is regenerated rather than keyed, flat lighting and a clean backdrop aren't required.

No. Change background replaces the setting with a new one; it doesn't cut the subject out, and there's no transparent or alpha-channel video output. If you need a cut-out for compositing in another editor, a background-removal tool is the right job; if you need a finished clip in a new place, this is.

That's part of the instruction: subjects are relit to match the new scene's light direction, colour and shadows, with consistent perspective and scale, and clean edges around hair and hands. A golden-hour beach warms the faces; a neon street throws coloured light. Choose a reference whose light could plausibly fall on your subjects.

Yes. Add the photo of the place as a reference and point to it in the prompt — "move them onto the street from @image1 at dusk". The engine matches its architecture or landscape, colours, time of day and weather. You can add more than one reference, for example a location and a weather mood, and name each.

It's the idea of separating people from their surroundings without filming in front of green fabric. Some tools do it by cutting the person out; Genjutsu does it by regenerating the environment around them, which also lets the light change. The trade-off: you get a finished clip, not a layer you can composite yourself.

Only with consent and without misleading anyone. A new background can make it look as if a real person was somewhere they never were, so edit footage you own, with the agreement of the people in it, and never use it to fake an alibi, a news event or a celebrity appearance. Label AI-edited clips.