FYI, OnSSI/Qognify Sales Engineering is free. They can give you pre-sales support on product features or system design. I recommend giving them a call. 😉
From my experience, things like this are usually integrated through Convergence to Pixels, which is a third-party. C2P turns a TCP/IP data stream into a feed that can be placed in Ocularis Client. I'm not sure about how to do the delayed email. I also recommend giving C2P a call.
I don't believe anything can be overlayed directly onto the video feed, but C2P can give you a feed to put in the slot next to the video. Here's a picture from C2P's website:
It looks to me like that's a web page on the left side (to allow interaction). On the right, there's a normal camera at the top, with two of C2P's feeds below it showing information from the TCP/IP device (in this case a DMP access control panel).