I do not think that's possible. At least in the current state, HTML5 cannot access the camera (or other peripherals). An alternative would be to create a PhoneGap application where you can develop an application in HTML5 (which will be included in your own application), with additional libraries (JS) that will allow you to access them.
PhoneGap: http://phonegap.com/start
api PhoneGap: http://docs.phonegap.com/en/1.0.0/phonegap_camera_camera.md.html