My opinion is that it would be much easier for you to modify the MRSS template to do what you want then to attempt to combine the videoplayer template with the mrss template. However, you could, for example, just pull the relevant parser functions from ShowFeed.brs and integrate those with your project for XML that is formattted for the videoplayer example.
If you break the problem down into smaller chunks you will get better answers. For example if you are trying to parse a particular feed and your parser is failing, you could post the section of code that you are having a problem with and a small subset of the feed, and ask for help with that.
- Joel