If you want to keep your Vita stock (unmodified), your options for PS Vita IPTV are very limited, but not zero.
CFW allows you to install VitaDB or Homebrew Browser, which contains media players that support IPTV protocols (HTTP Live Streaming, M3U playlists, and XMLTV EPG data). ps vita iptv
A dedicated PS Vita IPTV homebrew app created specifically for live streams. If you want to keep your Vita stock
