If your analytics implementation is via DTM, you can set the query parameter globally - https://marketing.adobe.com/resources/help/en_US/sc/implement/dtm/referrers-campaigns.html
Otherwise you could set s.campaign parameter in the page code - https://marketing.adobe.com/resources/help/en_US/sc/implement/campaign.html
The result would be available in the tracking codes report - https://marketing.adobe.com/resources/help/en_US/reference/reports_tracking_codes.html
Here is a descriptive article on campaign tracking describing how it works in Adobe Analytics - https://blogs.adobe.com/digitalmarketing/analytics/campaign-tracking-inside-omniture-sitec atalyst/
I hope these links will give you a fair idea, feel free to shoot further questions.
Thanks a lot for the info...
but can you provide us one example with screenshot for updating campaign tracking code. As I really don't know as what steps do I need to take for campaign.
I think this document would help. Basically to track a campaign you would have to add a Campaign ID parameter to the link - https://blogs.adobe.com/digitalmarketing/analytics/campaign-tracking-revisited-part-1-over view-advanced-solutions/
If you come from a Google world, you may be used to the UTM-code generator from Google. There exists similar tools for Adobe, where you can create and structure campaign codes, as well as uplaod classifications to be able to make some more complex and interesting analysis. Have a look at http://accutics.com/ for example...