If it works via USB as many cameras do today, you could use it just as a regular mass storage; plug it in, mount the memory and use your favourite file manager to copy the image files off it. Just like you would use a regular USB stick or a memory card. Actually it's just the same process if you took the memory card out of the camera, insterted it into a card reader and mounted it like any other memory card (the camera itself works as a "card reader" in case you plug it in and mount it). I'm pretty positive this works. What gphoto2 does is fetch thumbnails out of the camera's memory, fetch images, show EXIF information and so on - programs that use gphoto2 (like gThumb) then use it to fetch thumbnails, present them in a nice way, let you select them and then download the appropriate real image files from the camera. The use of gphoto2 is that you don't have to go through the directory tree on the memory card, it does it for you (and more).
So, before a driver exists or you write one yourself, you can use it as a mass storage device. HP cameras at least let you choose, from within the Camera's setup menu, if the camera should work as a mass storage device or as "camera"; if you can choose this, set it to mass storage mode and you should be fine.
If it's a new camera, it might take some time for somebody to write a driver.
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