Is it possible to input the data in the side panel and run the analysis in Shiny app and visualize the output?
I understand that it is possible to upload dataset and visualise the output in shiny app, but is there a way to enter data directly in the shiny web input panel and run the analysis and visualize data.
Yes, whole files can be uploaded by the user and processed in the app with fileInput() as described here. It's also always possible to have a textAreaInput() as described there, and parse the content.
In any case you will have to learn how to interact with Shiny, the book I linked is pretty good.