Check out this little gizmo.  Bags-Connection makes this camera mount.  It clips onto their standard tank mount bracket normally used to hold tank bags.    It has a limited amount of dampening built in and an adjustable camera platform.

Pashnit Moto products makes a camera mount with a simpler design and fewer movable parts.  To mount this unit you replace three of the gas tank ring screws.  The problem is you need tools to remove it.  As an add-on package to this unit you can get a mount that takes the place of the rear foot peg.  You can use it to mount a review-view camera.

The problem with both of these products is the price.  They range from $75 to $200.  I’m thinking that there must be a cheaper way.  Next time watch for my attempts to create a camera mount for my SV650.