Your Video is good however you can add instruction for users to use "Automatically send this device a Duo Push".
The above option avoids effort for users to click "Send me a Push" button. Also, if push is required on alternate number then user can always cancel the prompt and choose the alternate device from drop-down menu.
If video can cover above two points it will be more useful from end-user prospective.
Also, along with enrollment if you can come with video explaining different authentication methods available (Push, Call, SMS, Passcode) will add value.
The mouse hover for Duo options (in iFRAME) can help the users to identify functions on buttons available and will enrich user experience.