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Regarding Vuforia features

I need to clarify some of these features

1.Can we Recognise Barcode and QR code in vuforia and based on those result can we load the AR objects(Platform:Unity with UWP)?

2.Can we perform OCR(Reading text) particular part of the Image/Camera frame in Vuforia and perform AR overlays based on the result(Platform:Unity with UWP)?

3.Also can we display the Message like Warning at certain distance between trackable object and AR(Device) camera(Platform:Unity with UWP)?

4.Does vuforia provide SDK for Vuforia chalk(Android,iOS,UWP)?

1. Only VuMarks supported out of the box.  You'll have to add your own barcode or QR Code SDK to get those features.
2. No text recognition in the current version.
3. Yes, this should be possible.