This documentation is not using the current rendering mechanism and will be deleted by December 31st, 2020. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
If you have feature requests or want to contribute, please visit the Github page of this extension: https://github.com/astehlik/typo3-extension-html5mediakit.
Feel free to report issues or create pull requests.