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The Network Function Virtualization (NFV) technologies are fundamental enablers to meet the objectives of 5G networks. In this work, we first introduce the architecture for dynamic deployment and composition of virtual functions proposed by the Superfluidity project. Then we consider a case study based on a typical 5G scenario. In particular, we detail the design and implementation of a Video Streaming service exploiting Mobile Edge Computing (MEC) functionalities. The analysis of the case study provide an assessment on what can be achieved with current technologies and gives a first confirmation of the validity of the proposed approach. Finally, we identify future directions of work towards the realization of a superfluid softwarized network.