@Rohit:
In order to access google tools, they have to offer a public API.
If you don't have the libs and the API to access them, then its not possible to access them be it from Qt or any other place.
The problem you have in this thread is a communication problem.
It seems you do not fully understand what it is you are asking.
Qt can not allow access to anything.
Its the software being accesses, that has to allow access to it.
If your google tools offer such API you can access them from any application be it written with Qt or not.
So if you want to move forward - do what wysota suggested above:
Ask around in forums that deal with these input devices.
If they allow access through their API - most likely these forums will offer a "hello world" example, free of Qt or any other dependency.
THEN, you might want to use this in a Qt application, but then the access is not going to be your problem any more where we can help you further should you need any Qt related help.
Accessing external API is not something related to Qt and thus off topic for this forum.
I hope this helps you further.
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