Looking at Hola traffic on the network is difficult, and near impossible to deal with.
Hola VPN is a browser add-in that allows users to access geo-restricted content by making a VPN tunnel and manipulating DNS requests to make it seem like the user is in a different location. Can this traffic be monitored, caught and shaped? Unfortunately, it cannot be truly caught, just by the design of the application.
Hola manipulates DNS to contact DNS Servers in other locations and allows them to serve the page like it is a request coming from another location. The traffic on the host WAN can be reaching out to the DNS servers but it is not guaranteed; these DNS servers can change based on Hola's discretion.
Furthermore, Hola's VPN tunneling has been shown to use VPN endpoints of other computers running Hola, instead of the standard termination point of a static server. This not only forms a sort of P2P VPN network but also a highly dynamic environment that will change per connection, depending on the number of people in the world using Hola at a time.
At this time, there is no solution to block Hola traffic.