what illness led doctors to declare him unfit for work. we now know what led thoo this crash. the co-pilot locked the captain out of cockpit putting the plane into descent and crashing it into the french alps. if there were live streaming video inside the cockpit, would that change anything? bryan todd is out front with tonight's i.d.e.a. >> reporter: he locked himself alone in the cockpit as the captain pounded on the door. safety experts are calling for a bold move to avoid another disaster. cameras in the dockcockpit. >> the cameras would not be on the face. they would focus on the instruments and the manipulations that are made. >> reporter: former ntsb