The ornamental design for a camera accessory, as shown and described.
FIG. 1 is a front, top, right perspective view of a camera accessory, namely, a remote controller, showing our new design;
FIG. 2 is a rear, bottom, left perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof; and
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a cross sectional view thereof cut along the line 7-7 of FIG. 3.
The evenly spaced broken lines depict portions of the camera accessory that form no part of the claimed design. The dot-dash broken lines depict the boundaries of the claim and form no part thereof.