retrieve rendered video from the Cloud/camera roll

[#1]

I rendered my video,took several attempts, and wish to save it locally. It stated that it is saved to my camera roll. How do I access my camera roll? It implies that I have to render it again. 

[#2]

I rendered my video,took several attempts, and wish to save it locally. It stated that it is saved to my camera roll. How do I access my camera roll? It implies that I have to render it again.