start Video Call
open fun startVideoCall( @NonNull context: Context, @NonNull user: String, priority: Int, @Nullable completion: CompletionCallback)
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Call this method to start a new video call
Parameters
context
the application context
user
the international phone number of called party that you want to start with the call
priority
the call priority
completion
is a block of code which will be invoked when the call is created or fail to be created