Play (playback) icon helps in letting the site audience know that the tile is a video or YouTube content. This icon can be customized to be more aligned with preferred branding styles. Icons can be better rendered with transparent background with PNG or SVG format.
Customize play icon for video or YouTube tile:
Navigate to and select the target video or YouTube tile;
On the left pane, click Custom Icon under the Play Icon section;
Select the preferred or custom icon to be used from the Media Library, or your local machine using the +Upload Media button;
Set the preferred crop in the cropper utility;
Click Crop button.