$(function() {
    $(window).scroll(function() {
        $('.wp-video-shortcode').each(function() {
            var str = $(this).attr('id');
            var arr = str.split('-');
            typecheck = arr[0];
            if ($(this).is(":in-viewport") && typecheck == "video") {
                var video = new MediaElementPlayer($(this).attr('id'), {
                    success: function(mediaElement) {
                        $(this).attr('id')[0].player.pause();
                        console.log($(this).attr('id') + 'video is playing');

                    }
                });

                //$(this).[0].play();
            } else {
                //$(this).[0].pause();
            }

        });
    });
});

<video class="wp-video-shortcode" id="video-1115-1" width="792" height="470" poster="http://cdn.ultrasoundoftheweek.com/post_files/uotw16.1.jpg" loop="1" preload="none" controls="controls">
<source type="video/mp4" src="http://cdn.ultrasoundoftheweek.com/post_files/uotw16.1.mp4?_=1" />
<source type="video/webm" src="http://cdn.ultrasoundoftheweek.com/post_files/uotw16.1.webm?_=1" />
</video>