The photo on their home page shows someone reading an SMS, not watching a video. The SMS is from someone recommending a video, but there's no indication that you can actually watch the video while you drive.
It's a poor choice of image, though obviously they were just trying to embed the "Hey, watch our video in your browser" instructions into the photo itself.
Aside from that, even reading SMS while you drive seems like a bad idea to me. But I'm really tempted to get a Navdy for features that improve safety, by moving stuff that I already look at (speed, navigation) from my dashboard to the HUD. I've been shopping for cars recently and wishing that HUDs were available in more affordable models. I just hope you can turn off Navdy's text/call notifications and other extras.
And they still haven't changed their homepage.
Navdy could be really useful, even improving of total safety, as HUD navigation. But maybe that's not where the money is.