To keep the same structure but replace the home search form with a video you need to edit a file template file.
First thing you need to install and activate sweetdate-child theme.
After that, copy wp-content/themes/sweetdate/page-parts/home-search-form.php to sweetdate-child/page-parts/home-search-form.php and edit it.
This code will add a youtube embed(replace the whole content):
COPY CODE
<div class="twelve columns">
<div class="row">
<div class="five columns">
<div class="flex-video">
<iframe width="560" height="315" src="//www.youtube.com/embed/WcovKsjvVgM" frameborder="0" allowfullscreen></iframe>
</div>
</div>
</div><!--end row-->
</div><!--end twelve-->
To have the video bigger you need to change “five columns” to “six columns” or “seven columns” and so on