You have voice command for apps turned on in the general settings for the phone. Go to Settings -> Language and input -> Voice cmd for apps. Switch that off. If you want to use voice command for apps for some of your other apps, you'll just have to ignore the icon for the camera (or use a third-party camera app).
Current lineup: Galaxy S5, iPhone 5S, Note 10.1 (2014)
Previous smartphones: Note 3, HTC One, Note 2, Galaxy S3, One X, RAZR MAXX, Galaxy Nexus, Rezound, Note, iPhone 4S, Bionic, Stratosphere, Charge, Vitality, Incredible 2, Thunderbolt, Palm Pixi Plus, Droid 3, Fascinate, Incredible, Droid Pro, Droid 2 Global, Droid X, Droid, Treo Pro, Touch Pro 2, Touch Pro, Q9m, XV6800, XV6900
Previous tablets: iPad Mini, Transformer TF300, Evo View, Transformer Prime, Transformer TF101, Thrive, gTablet