The BBC iPlayer app, which provides streaming and downloadable access to BBC television shows in the UK, has joined Hulu and Pocket in supporting the new Picture in Picture feature in iOS 9.
As with other apps, press the home button once while playing a show and the video window becomes a small floating window that you can resize and reposition while using other iPad apps. The functionality is available on the iPad Air 2 and iPad mini 2 and 3.
iPlayer is a free download from iTunes. MLB At Bat has also joined the party.