As you can see many elements are seen as they are outside, i wanted video in which as you can see the green part only. What should I do to achieve this?
I think you want to match the properties of the canvas with the render settings.
If you press F8 to open the properties, you can copy the image area values from there.
(defaults for me are TopLeft(-16,9),BottomRight(16-9), Size(1920,1080))