That's a very broad question and salaries in the video games field cover a broad spectrum. On the low end, QA (quality assurance) testers may earn around minimum wage; while the high end of people still actually making the game (executive producers, etc.) can earn high six figure salaries or more. If you expand to executives, like CEOs and company presidents it will be on the order of millions. Programmers and artist may generally start around $30-50k for entry level positions depending on location and the company.
I recommend checking out a few websites to find more information:
Gamasutra is a good website for industry information
Gamasutra also has a career guide for the video game industry with a wide variety of resources and links
Glass Ceiling has a lot of data on specific job listings and salary ranges