GoVideo Free -
There is no option to configure the CNAME in the URL of the Sharing Page.
GoVideo Enterprise -
You can modify the link for where your video is located through the Sharing Page.
However, first ensure that your branded sharing page feature is configured so that changes to the sharing page apply to GoVideo users. Contact your customer success manager or Vidyard technical support to have this enabled.
Once enabled, see on our article on how to set up a sharing page for further information.