create_ugc_video_overlay is the dedicated tool for the classic reaction/UGC layout: a base video (a screen recording, gameplay clip, product shot) with a talking-head or reaction video positioned in a corner on top of it.
For a simpler, single-base-plus-single-overlay job, this is more direct than compose_video_with_overlay's fuller mixed-media pipeline — reach for this one when your base is a single video and you just need a PiP layer added.
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Overlay a video (e.g., talking head, reaction clip) on top of another video to create UGC-style content.
What to tell the agent
Versely's agent maps this plain-English request directly onto create_ugc_video_overlay. You don't need to know the parameter names — just describe what you want.
“Overlay this talking-head clip in the bottom-right corner of this gameplay footage.”
How it works
1. Pick the base video
slideshow_video_url is the underlying footage the overlay sits on top of — despite the name, this works for any base video, not just slideshow exports.
2. Pick the overlay clip
overlay_video_url is the reaction/talking-head video layered on top.
3. Set position and size
position (a required field) places the overlay in a corner; overlay_size / overlay_scale control how large it appears.
4. Handle the overlay's own background
remove_black_background strips a black backdrop from the overlay clip if it was rendered on one, so it composites cleanly.
What it costs
Billed as a standard editor composite operation. Ask the agent for estimate_cost before running on a long base video.
The formula behind that number: What does editing a video cost if I keep changing it? — charges per finished export, so iteration is free and the count is the whole bill.
Limits & things to know
- position is required — you must place the overlay in a defined corner rather than a free-form pixel location.
- remove_black_background only strips a black backdrop specifically — a different-colored overlay background needs the general background-removal tools first.
- For combining multiple base clips or images plus an overlay, use compose_video_with_overlay instead — this tool is built for a single base video.
Who uses this
- Reaction videos with commentary in the corner
- UGC-style ads with a talking-head presenter over product B-roll
- Gameplay or screen-recording commentary layouts
Frequently asked questions
Does this only work with slideshow exports as the base?+
No — despite the slideshow_video_url parameter name, it accepts any base video, not just slideshow exports.
Can I control how big the overlay appears?+
Yes — overlay_size and overlay_scale control the corner overlay's dimensions.
What if my overlay clip has a black background?+
Set remove_black_background to strip it so the overlay composites cleanly onto the base video instead of showing a black box.
See it in a workflow
Related Versely tools
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