Is it possible to call Bibtex files for citation in MS PowerPoint. Is there any such add-in or software to do this?
As far as I know is there no possibility to call BiBTeX in PowerPoint.
What you can try is to use a program like citavi or perhaps Menderly or ... If these programs are able to import a bibtex file you can use them to integrate your citations into Powerpoint. As far as I know you can use Citavi in PowerPoint.