How to export video from unity3d

i done my camera animation in scene. i wants to export the animation as a video. Please help me how can i do in my unity 5.3.
thanx

i wants to create architecture walkthrough for add it in my showreel. but i cant output in unity 3d. any other option. i have done camera animation in the interior design, now i wants to render the camera output to the video or image sequence.