Javadoc
The q parameter specifies the query term to search for.
Your request can also use the Boolean NOT (-) and OR (|) operators to exclude videos or to
find videos that are associated with one of several search terms. For example, to search
for videos matching either "boating" or "sailing", set the q parameter value to
boating|sailing. Similarly, to search for videos matching either "boating" or "sailing" but
not "fishing", set the q parameter value to boating|sailing -fishing. Note that the pipe
character must be URL-escaped when it is sent in your API request. The URL-escaped value
for the pipe character is %7C.