You can also define a thumbnail image for the previous ans next videos that will appear over the appropriate button when you move the mouse over it. The height of the thumbnail image is 126 pixels, the width adjusted accordingly.
Next and previous functions can also be activated using keyboard shortcuts SHIFT+N and SHIFT+P.
Code snippet
<script>const player = videojs("my_player", {license: "key"});player.nuevo({prev: {url:"//previous-video-url", thumbnail:"/path-to-previous-thumbnail.jpg"},next: {url:"//next-video-url", thumbnail:"/path-to-next-thumbnail.jpg"},}</script>