It's possible: I was interested in the same thing a few years ago, but it never happened because I couldn't justify the price for the hardware.
Basically you use the HDMI output of your Pentax camera and connect it to an HDMI input card on your pc. I haven't tried it myself, but from what I remember reading, a company named Blackmagic manufactures these pci-e cards. It should be possible to use it as a webcam or stream it on the web if you want. It's quite an expensive solution and I think you'd be better off with a good webcam for the price.
I remember I couldn't find a driver to use it directly via USB. As Adam pointed it out, you need someone to write a driver for that. I believe this has been done for some Canon models if I remember correctly.
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