In this gallery we added a video from Vimeo. We decided to add automatically play the video when the page loads but you can choose your favourite behaviour.
If your video has controls (play, stop, etc.) then you shouldn't let the plugin to crop it, otherwise the controls could be cut.
So, add the attribute data-ftg-keep-aspect-ratio="true" to the element with the tile class.
<div class="tile" data-ftg-keep-aspect-ratio="true"> <iframe src="https://player.vimeo.com/video/204451040?autoplay=1&byline=0&portrait=0" width="800" height="450" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> </div>