Hi
When you edit the custom-html module a typical office day you should first disable your default editor from Global configuration otherwise when you save it the code inside is stripped out
disable it and edit your module with this code
<div class="video-wrapper"><button class="btn btn-play"><i class="fa fa-play"></i></button> <button class="btn btn-pause"><i class="fa fa-pause"></i></button><div class="mask"></div>
<iframe id="player1" width="100%" height="100%" frameborder="0" allowfullscreen="" mozallowfullscreen="" webkitallowfullscreen="" src="//player.vimeo.com/video/94101559?title=0&byline=0&portrait=0&api=1&player_id=player1"></iframe>
</div>
Change video references with your video url