This video is an example of the classic Baking Soda and Vinegar reaction. What this actually is, is a base and acid reaction with baking soda as the base and vinegar as the acid. The Chemical equation for this reaction is:
CH3COOH + NaHCO3 -> H2O + NaOCOCH3 + CO2
the bubbling you see is the escaping carbon dioxide gas. Enjoy the video!