How to localize the video in Unity

We are developing Unity VR app for iOS platform. In this app we are playing 360 degree video using Easy Movie texture. But now we want to localize the video. Adding multiple videos for different language will increase the size of the binary. So we were thinking to play video and audio separately in sync using Easy movie texture so that for localisation we will change only audio files.So please let us know is there any way to do it.