You have two factors to consider; the physical attachment and the Voltage compatibility.
The physical attachment is pretty easy. Many DSLR's do not have a PC terminal, though many higher end models still do. If your camera does not have one, then a hotshoe adapter is available for all DSLR's I know of, and many (though not all) mirrorless cameras, as well as some point and shoots.
But, there is also the Voltage compatibility. All of our current lights have a trigger voltage of less than 6V, however, the 5K and 10K's had voltages greater than this, and could potentially be damaging to some cameras.
I have seen two different Voltage ratings on cameras, either 6V or 240V. The max Voltage is typically found on the page(s) that discuss the hotshoe and/or PC terminal. If the Voltage is not listed, then assume it is 6V and do not connect the flash directly to the camera. If it is 240V, then you are safe to connect.
An option that is favorable, even if it is both possible and safe to connect to the camera, is to use a radio remote like Cyber Sync
http://www.paulcbuff.com/cybersync.php. This removes the cord which reduces tripping hazards, lengthens range, and is Voltage safe.
If needed, a hard wire connection can still be made with a device like a safe sync adapter, that will reduce the incoming voltage to <6V.