Why do official Olympics youtube channel in USA hiding Indian videos?

If you want a definitive answer on why YouTube make the decision they make about which videos to show, you'd have to ask YouTube. Looking at the general case, there are two primary reasons why a social media account might do this:

1. The right to show certain content in certain territories. The rights to show the Olympics are enormously complicated (and expensive) - it may be the case that the rights to the Indian-specific videos do not allow them to be shown in the USA.
2. Interest of fans. There is no law which says a social media account has to show the same content in every country (at least, not in the USA). It is a perfectly valid editorial decision for whoever is managing the content on the Olympics YouTube channel to say that a video about a non-American athlete competing in a sport which is barely played in America with non-English commentary is of very low interest to American fans.