Hi
There are a tons of video converters free and not. For example, the world famous Gordian Knot pack, or something like that. You absolutely not need to develop anything again.
And moreover, first of all, the DVD menu is strictly DVD feature and never exists outside of this technology because is senselessly. Second, this is named DVD-ripping and forbidden in many countries due to copyrights protection laws and your proposal is not eligible on so small budget because it a serious risk for employees.
And the last, as I know at least a few video players could play DVD under android, but anyway any copying DVD disk to any computer is violation of copyrights, be very careful when you will use it.
I not pretend on this task but I just would like to warn you about all above.
Best regards!