Access Native Video files from Unity on Android / iOS

I am required to investigate the potential to access video files from the native video storage locations on Android and iOS using a Unity Pro project. Although video playback seems to be limited to full screen playback on these platforms, I would like to know if there is a cross platform (or otherwise) way to simply access these files from within Unity (without passing them first to the fullscreen playback process), possibly using a plugin from the asset store or by writing a Java/ObjectiveC project that passes the video onto Unity. Paid solutions are acceptable but I can't find an exact solution for this issue that I'd have expected to be quite simple. Thanks in advance for any help/pointers.