Получилось!
// Play Video
$(function() {
var $video = $('video');
var $window = $(window);
var i;
var acc = document.getElementsByClassName("features__video");
$window.scroll(function() {
for (i = 0; i < acc.length; i++) {
if ($video.is(":in-viewport")) {
$video[i].play();
} else {
$video[i].pause();
}
}
}
);
});