add_action( 'wp_enqueue_scripts', function(){
    // Declare your request headers
    $headers = array(
        'foo1'      =>  'value1',
        'foo2'      =>  'value2'
    );

    $headers = json_encode( $headers );

    $custom_scripts = "
        videojs.Hls.xhr.beforeRequest = function(options) {
          options.headers = videojs.mergeOptions( {$headers}, options );
          return options;
        };
    ";

    wp_add_inline_script( 'player', $custom_scripts );
} );