Can we used Google API & YouTube API for our commercial video streaming products?

we have to develop a commercial video streaming application for iPhone & within that app we are planning to integrate additional searching functionality for Google Video & You Tube. I want to know following points,

1. Where can i find the Google video API & Y开发者_StackOverflowou Tube API ?
2. Will there be any legal issue on Google Video & You Tube video integration on commercial products, Form whom we have to the approval? Is there any standard procedure on this

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You are allowed to do this but there are some restrictions

Take a look at the Terms of Service Point 1.2 Commercial Usage and Using the YouTube APIs to Build Monetizable Applications (too much to include in this answer)

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Objective-C APIs for Google services are at http://code.google.com/p/gdata-objectivec-client/

YouTube provides an API, including video searches; Google Video does not.

Google APIs are intended for use in commercial applications, but carefully read the YouTube FAQ and the associated terms of services documents.