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/ b) In lib/output.php, change

$opts = apply_filters( 'infinity_images', array( '1', '3', '5', '7' ) );

/ to

$opts = apply_filters( 'infinity_images', array( '3', '5', '7' ) );

/ We will now exclude Front Page 1 section from being able to be set and get a background image via the Customizer.

/ a) In lib/customize.php, change

$images = apply_filters( 'infinity_images', array( '1', '3', '5', '7' ) );

/ to

$images = apply_filters( 'infinity_images', array( '3', '5', '7' ) );

Step 2
Create a static Page titled say, Home.

On this Page, in the Video Background meta box specify .front-page-1 for the Container.

Upload/select the links to your video’s mp4, webm and poster image.

https://sridharkatakam.com/video-background-infinity-pro/

Install and activate Video Background plugin.

Set Home as front page at Settings > Reading.