Video in/out possible?

[BenStoked]

so I was googling around, trying to remember some stuff about usb cables, and I hit the wikipedia site. found what I wanted, but I also found this:

Originally Posted by Wikipedia

HTC manufactures Windows Mobile-based Communicators and the T-Mobile G1 which have a proprietary connector called HTC ExtUSB. The ExtUSB combines mini-USB (with which it is backwards-compatible) with audio/video input and output in an 11-pin connector

So this piqued my interest, and decided to find out where google would take me from there.
found this video:
Video: HTC Touch Pro video out demo
okay, so now I am really curious:

can we have video in/out on our phones?

what would it take to make it work, assuming the hardware is available inside our phones. (I don't assume its not, because, when I bought my phone it had no GPS, and now it does...).