Hello,
We are working on the similar project and we can surely assist you.
We have explored the API's also and out of twilio, tocbox, and Vidyo, VIDYO is best to go for.
We are among top 1000 freelancer here, and well known for our quality work, have delivered 200+ websites in last 24 months. You can checkout our profile, to confirm further.
Technically we are competent in PHP (v5.5 & 5.6), CodeIgnitor, WordPress, Magento, Joomla, MySQL, HTML/HTML5, CSS/CSS3, Ajax, jQuery, Bootstrap v3, JavaScript etc.
we are readily available & would be happy to discuss further.
Regards,
Brijesh R, Web Expert