Hi Atul,
Campaign header data can be fetched from table CGPL_PROJECT.
CRM_MKTPL_ATTR is the table which contains campaign attributes.
If it is a custom field, try this option:
Keep the cursor on the field in edit mode, press F2 and you will get the technical information such as component name, view name, context node and attribute name.
Go to transaction BSP_WD_CMPWB and open the component, go to the view and drill down the context node to get the corresponding BOL entity.
Go to the BOL Repository Browser and find the BOL entity to get the attribute. You will find the data element. Do a where used on it. You will find the table.
Hope it helps.
Regards,
Sayan