A: Yes, your question is absolutely clear, and here's how it works with Gumlet:

Gumlet’s embed player is fully responsive and adapts to whatever dimensions you set in your iFrame. If your source video is vertical or square, you can simply set the iFrame’s width and height to match that aspect ratio. In that case, the player will display the video without adding black bars.

Black bars appear only if the player container’s aspect ratio does not match the video’s aspect ratio.

Example (vertical video):

<iframe
src="https://play.gumlet.io/embed/{{asset_id}}"
width="400"
height="533"
frameborder="0"
allowfullscreen>
</iframe>

As long as your iFrame dimensions reflect the video’s shape, the player will scale accordingly.

You can find more details in the “Embed & Stream” section of our documentation—docs.gumlet.com.