Can you filter a web page activity report by email campaign?

Yes. The filter you want would be member of a program. Key would be to add the condition that they had at least the status of opened in the program.

Edwin,
Assuming you had a few links in the e-mail you sent out, you could also create a Smart List with the filter
"Clicked Link in Email", with the condition Email = Name of the specific email you used in the campaign you're interested in seeing the data for.

This would give you who clicked on the links in the e-mail to get to your site. Hope this helps. Thanks!!

You can generate an Email report by going to Analytics >> Email reports >> Email Link performance and apply the filter "Click link in email" . This report will show you the link and the number of people clicked on it.