wp_insert_post( array(
    'post_title'    =>  'My video title',
    'post_content'  =>  'My video content',
    'post_type'     =>  'video',
    'post_status'   =>  'publish',
    'meta_input'    =>  array(
        'video_url' =>  'https://www.youtube.com/watch?v=rMGEMYaQiOg&t=210s',
        'layout'    =>  'small'
    )
) );