Plus, as Sam has already stated above, Wix Video is an app and not part of Corvid, therefore you need to read its own support pages or contact Wix Support for more help with it.
https://support.wix.com/en/wix-video/getting-started-with-wix-video
https://support.wix.com/en/the-wix-editor/video
https://support.wix.com/en/article/contacting-wix-customer-care-for-support