function videotube_ads_before_video(){
    ?>
    <!--your ads goes here-->



    <?php
}
add_action( 'videotube_before_video', 'videotube_ads_before_video' );


function videotube_ads_after_video(){
    ?>
    <!--your ads goes here-->



    <?php
}
add_action( 'videotube_after_video', 'videotube_ads_after_video' );