A bit of follow-up:
'v4l2sink device=/dev/video1' may not always work. Depending on what software you're using or what video devices you have on your machine, you may have to run the command:
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sudo modprobe v4l2loopback
...and then try video2, 3, 4, etc. until you find one that works. If you get:
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Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
...then you know it's working.
There isn't a lot of documentation on the Blackmagic Gstreamer plugin that I can find by Googling, but if you type:
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gst-inspect decklinksrc
...you'll get a list of different modes to use, as well as different commands. As stated earlier, mode 11 is 1080 59.97i, which I believe is what most HD camcorders output. If you're feeding from a PS3 for example, it may be different.
For my purposes, I use a USB mixer for audio, so I don't need it from the camcorder. But according to another post, it's possible to use ALSA snd-aloop to pull audio from the Intensity Pro and route it to a virtual audio device. I'll post more if I ever get around to setting that up.
Feel free to contact me with questions, and I'll do what I can to help.