nginx location rule to redirect non existing images to another server

gistfile1.nginxconf

    #Rewrites the request, extracting a fragment of the file name and using a remote server.
    location @fetchFromRemote {
    	rewrite ^/path/to/images/(.*)$ http://remoteserver.com/other/path/to/images/$1 redirect;
    }
    
    #Will try to see if we have the file in this server, is not will use fetchFromRemote
    location ~ ^/path/to/images/.*(png|jpg|jpeg|gif|ico|swf)$ {
    	try_files $uri @fetchFromRemote;
    }