project section - "play" type button watermark on video thumbnails

When using a project listing type of section, you are able to paste in a video link but it would be able to click an option to add a watermark for the video thumbnail so that its obvious that this is a playable video. I get around this by 1. editing the image to add that watermark, or 2. by adding "(play movie)" to the text of the project, neither feels like a strikingly kind of awesomeness utility that I've come to love about strikingly.