Not Free, Too Expenseive, Others are Free

Here are alternatives to Vidtok (who conceals that they charge for their plugin) that are actually free:

https://www.ads-software.com/plugins/wprtc-real-time-video-for-wp/
(Minimal features, post updated, aggressive development)

https://www.ads-software.com/plugins/barc-chat/
(A lot of features, a lot of downloads, not updated in a while)