You can set any of your lead capture pages containing the word "Video" in the title as your main website URL to allow visitors to watch your company video before deciding to opt-in to view more information. 

To view your lead capture pages, just go to My Marketing Pages > Lead Capture.

To change your main website URL, just go to My Marketing Pages > My Links. In the top box on this page, you can select a lead capture page from the drop-down menu and hit save to select which lead capture page appears as your main website URL.