The ornamental design for a camerahousing, as shown and described.
FIG. 1 is a lower, front, left perspective view of a camera housing;
FIG. 2 is a lower, rear, left perspective thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
Features shown in dashed lines in the drawings are included for the purpose of illustrating unclaimed portions of the camera housing and form no part of the claimed design.