Shweta,
I think you misunderstood the question. He/she is asking about a pixel in an Adobe Campaign email. The instructs you sent are for capturing campaign information from an ad server and do not apply to Adobe Campaign
I found a story on the Adobe blog that states Princess Cruises did this:
User Identification - built email pixel with an ID sync to identify visitors who don't always authenticate
Insights - Identifiable audiences grew 3x with email and Analytics ingested into Audience Manager
I am very interested in learning more about inserting a pixel with an ID sync into an Adobe Campaign email to identify visitors who don't always authenticate. Can you point me towards that? Glenn