Absolutely not! It shouldn't be. In Hungarian, no pronouns are ever capitalized. The only exception used to be writing personal/official letters, but even there it's not a rule to capitalize, it's just an accepted deviation from the rule, and absolutely not necessary.
Capitalization is supposed to convey extra respect, but actually: capitalizing any pronouns outside some official documents seems very over-the-top (and frankly, ridiculous).
For those who speak Hungarian: http://www.e-nyelv.hu/2012-03-29/on-on/, http://xn--helyesrs-fza2j.mta.hu/helyesiras/blog/show/nagy-on-kicsi-on