YouTube Search package searches YouTube videos avoiding using their heavily rate-limited API. It uses the form on the YouTube homepage and scrapes the resulting page.
This notebook shows how to use a tool to search YouTube. Adapted from https://github.com/venuv/langchain_yt_tools 
%pip install --upgrade --quiet  youtube_search

from langchain_community.tools import YouTubeSearchTool

tool = YouTubeSearchTool()

tool.run("lex fridman")

"['/watch?v=VcVfceTsD0A&pp=ygUMbGV4IGZyaWVkbWFu', '/watch?v=gPfriiHBBek&pp=ygUMbGV4IGZyaWVkbWFu']"
You can also specify the number of results that are returned 
tool.run("lex friedman,5")

"['/watch?v=VcVfceTsD0A&pp=ygUMbGV4IGZyaWVkbWFu', '/watch?v=YVJ8gTnDC4Y&pp=ygUMbGV4IGZyaWVkbWFu', '/watch?v=Udh22kuLebg&pp=ygUMbGV4IGZyaWVkbWFu', '/watch?v=gPfriiHBBek&pp=ygUMbGV4IGZyaWVkbWFu', '/watch?v=L_Guz73e6fw&pp=ygUMbGV4IGZyaWVkbWFu']"