playVideo is not working in ionic v1

I am using this plugin in my android APP build in ionic v1.
I used bower to install this plugin.
I followed all steps.
Video is perfectly loaded but when i try to play with an external button using function playVideo().
video is not playing.
Please help. do in need to set any permission from devleoper console ?

Reproduce the reported behavior in an Android app built with Ionic v1 and installed through Bower, using an external button to call playVideo(). Start by tracing the directive's playVideo integration and checking whether the issue is related to Android permissions; done means external-button playback works or the required limitation is documented.

Written by the indexing model from the issue text.