I was thinking to invoke `vainfo` and grep the output, but it is not better that `vaInitialize()` because:
1. It need use install vainfo pkg, it is not installed by default
2. grep shell output suppose bad performance than calling api.

Furthermore, `vaInitialize()` will definitively called when VDA is running. I do not have the cost that `vaInitialize()` is need, but at least the functionality is working. Do you have other way to get the driver path?

Alternatively, we can hard code for Tizen only, and use `vaInitialize` solution for other linux. @kenchris , @tmpsantos   is okay for you?