The ornamental design for a surveillancecamera, as shown and described.
1. Security camera
1.1 : Front
1.2 : Back
1.3 : Left
1.4 : Top
1.5 : Bottom
1.6 : Perspective
1.7 : Perspective
1.8 : Perspective
1.9 : Perspective
1.10 : Reference View in a position of use
1.11 : Reference View in a position of use
The dotted broken lines in the drawings illustrate portions of the surveillance camera which form no part of the claimed design. The dot-dot-dash broken lines depict environment and form no part of the claimed design.