If storing the camera in one of the hard cases is not what you were looking for.
1- some dedicated riding jackets have pretty big pockets (look at some of Firstgear's stuff (My old FG Kilimanjaro could store a DSLR in one of the front pockets if you really had to
2- Tank bag - many different manufacturers and prices - some even give you place to 'lay down on' during longer rides

A 'hard shell' tank bag might even be more protection if you want.
3- in my younger/foolisher student days, I had a shoulder bag (satchel) that I would wear when commuting - I adjusted the strap so that the bag sat on the rear seat and kept the strap wrapped around me like when I was wearing it walking around.
I've seen many writings that forbid wearing a satchel or backpack when riding - the fear is that the bag will complicate your body when you have an accident or otherwise leave the motorcycle (strap catches something - motorcycle drags you along, or instead of landing on your back, you land on your backpack, which has a sharp item in it that pierces your skin etc...
4- The old stand by - the bungee net - cheap, easy, mostly reliable.
the camera you mention doesnt look that big ?
-John