Seeing this, I cannot imagine how the military and special forces in particular are not actively trying to both recruit these kids and to train using some of their methods. Would be great for commandos or assault troops (presuming you could deal with the weight of gear issue).
I've loved parkour for years and it's very likely that we're going to see much more in action films over the coming years as it raises the standard of what is possible (a la the latest Bond film which opens with a parkour-inspired chase).