When using a Vimeo video ID on Swapcard, the video does not automatically play. Once the countdown ends and the video appears, users will still need to press play, whether it is a live or a pre-recorded video.
If you would like to have the video autoplay as soon as the countdown ends, you will need to opt for the use of the video iFrame instead.
To do so, you will first need to get the iFrame of the video in question from Vimeo. For this, go to the Vimeo video of your preference and click the Share button in the upper right corner of the video player.
In the pop-up that opens, click on +Show Options.
In the list of options available, check the box next to "Autoplay this video". Then, you will have to copy the Embed Code and paste it onto Swapcard.
You can also do this manually, by adding the parameters suggested by Vimeo in this article.
Note: this method will only work for Public or Password-Protected videos. Also, keep in mind that some browsers specifically block autoplay.