Disconnect the camera cable by sliding it horizontally out of its socket.
If you see a small plastic retainer stuck to the logic board that prevents the camera cable from sliding out, peel it up carefully from the logic board. Apply a little heat from a hair dryer or heat gun if necessary to help soften the adhesive holding it in place. Do not attempt to forcibly disconnect the cable with the retainer in place.
If you still have trouble, use the point of a spudger to push at each side of the connector and "walk" it slowly from its socket.