As common in WordPress the solution I can give You requires human engineering as well as coding.
Meaning You got to do something in a certain way as a WordPress user to get the required result.
This is the way I got any content, including Video above the "read more" line:
<?php $temp_query = $wp_query; ?>
<?php query_posts('category_name=yourcategoryname&showposts=5' . '&meta_key=number' . '&orderby=meta_value_num&order=asc'); ?>
<?php while (have_posts()) : the_post(); ?>
<div class="slide front post" id="post-<?php the_ID(); ?>">
<? if($content = $post->post_content ) {
echo "<div id='entry'>";
global $more; // Declare global $more (before the loop).
$more = 0; // Set (inside the loop) to display content above the more tag.
the_content();
echo "</div>";
} else {
echo '<img src="Your alternative image url here" alt="Image alt" title="Image"/>'; } ?>
</div>
<?php endwhile; ?>
<?php wp_reset_query();?>
1) A category for all featured posts is created as usual
2) That category name goes in the place of the placeholder "yourcategoryname"
3) Modify the number of posts displayed inside the category
4) If need be put them in the order they need to be displayed by using the custom field "number" - if not delete the meta_key and orderyby parameters.
Also, there should be an alternative image, when for example You do not have an image to show, that takes up the space.
Note that this code works with sliders that use an div to seperate the different slides. The div needs to be styled with CSS in order to show one post at the time.
Then You need to futher develop or hire someone to develop in order to show the video or the image You get along side the text You might pull from the excerpt.
As confusing as it can be, but that is the way it should be done.
Also note that video does not work with automatically changing sliders in Internet Explorer - it freezes up when the animation changes. One needs to go extremely slowly with the automatic movement, in fact so slowly that there stops being a point to it in order to get the effect to be smooth.
I would speculate that is the reason why all the major sites like Apple, only use video inside a slider that moves on user input.