Sure - and by using that kind of software, you are building a monster by taking a software that is made for a different thing to do a single job. Also, the interfaces of these programs are about as far from ideal as you can get.
On top of that, they degrade the performance of the machine they are running on...
Always keep as little as possible running on the computer if you do any kind of production. With your signal running through hoops on your computer, only a small hiccup is needed before it all comes tumbling down.
Better get direct support for any video devices that are accepted on a computer. The same we have today with audio. There is no limitations on what audio source you can use. So why should there be any for video?