Is it possible to activate audio in my website for any embedded videos using a javascript/jquery plugin?

I have a website which plays Vimeo videos. Many of these videos have its trailer playing in the background and we want to play the sound of the trailer when the page loads.

I wanted something like asking visitors their approval to play sound on those embedded trailers when they reach the site. Something like setting a cookie with the approval:

<p class="audio-notice">
    This site works better with audio enabled by default
    <button onClick="enable_video_sound()">Enable sound on video tailers</button>
</p>

<script>
    var play_sound = <?php echo isset( $_SESSION['enable_video_sound'] ) && ( $_SESSION['enable_video_sound'] == 0 ) ? 'true' : 'false'; ?>;

    function enable_video_sound(){
        if( play_sound == false ){
            // Set the SESSION variable
            play_sound = true;
        }
    }

    $(document).ready(function(){
        // When a video is plays
        // Do something to set the volume of the playing clip at 100%
        // 
    });
</script>