We are sometimes asked, "Is there a way to force a video to fill the iframe instead of having black bars?"

The short answer is no. There's no way to force a video to fill the iframe.

But the good news is that there is a way to fit the frame to the video aspect ratio (i.e., no black bars.)

TLDR: If you want the video to fill all the space in the player, you must set the iframe dimensions using the same ratio as your video.
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For a 1280x720p video you can use an iframe size of:

To explain a bit more...
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The black bars are related to the display size and the ratio in use in the video. The video is displayed in our player in an iframe.

The iframe code contains two attributes whose values can be changed in %(of the parent container) or absolute pixel value.
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E.g., If you display the iframe with width and height at 100%, the player will take all the available space.

At this point, the black bars are shown because of your display size. Then if you decide to embed your player in an iframe that fits your video ratio, you won't see any black bars.