There are 2 ways of setting up a video banner:
Against the banner there is this field where you can paste a YouTube video ID.
This would open a popup with the YouTube video when the customer clicks on the banner.
YouTube Link -
youtube.com/watch?v=Ox1Q4NIcg9
YouTube video id - Ox1Q4NIcg9
You will also need to tick the Video checkbox.
You can upload an mp4 file against the banner. This would display exactly the same as an image, but would be a looping video.
Please note: If there is more than one banner uploaded the carousel will go through the images/videos (it will not wait for the video to finish playing) as usual.
Please note: The carousel will display each slide for 5 seconds before going through to the next item so take this into consideration when loading the video.
These videos are meant to be short promotional videos, max 400-500kb in file size which usually results in around 5-6 seconds length depending on the video is optimized.
An example video would be something made up
from bits of a Kit Launch reveal video:
https://www.youtube.com/watch?v=nLlBK8VoubA
In terms of setup you need to tick Video and load the file against the banner.