Hi @Sunita Jodha ,
As far as I know,there is no such way to display Powerpoint in spfx. But we can integrate a webpart into spfx project.
Open the existing directory structure containing spfx in the command promp and run the following cmdlet.
yo @microsoft/sharepoint
The yeoman generator again, fill up the details like webpart name, desc etc and it will automatically detect, handle and add the new webpart to the existing solution.
Then we will get two web parts like following. And we can display OOB File viewer in webpart2
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