This is hard question because it has a long history.
First, UGENE v1 is an experimental version in it's API, so remote tasks runner was rewritten several times and now looks different from what is shown in this video.
A year ago UGENE run the server internally and was able to connect to any other UGENE instance and run tasks.
Today (v1.9) a dedicated service is used to run remote tasks, not UGENE. The protocol was also changed a lot - now every remote task is wrapped as Workflow Designer scheme.
We have test server you can use freely to run remote tasks:
http://ugene-service.com. This service is run in Amazon EC2 environment.
The source code and API will be stabilized and released only in UGENE v2.0 branch. Today you should always use the latest UGENE v1.x version to run tasks on
http://ugene-service.comHope it helps.