Nginx Ingress SSL Passthrough

I am trying to add nginx ingress controller with ssl passthrough for one service and ssl termination for other services. According to the documentation present at TLS/HTTPS - NGINX Ingress Controller it leverages SNI and needs virtual domain for services and also requires to have compatible clients. What does this mean ? How do I achieve this configuration in nginx ingress/controller. ?

Necessary annotations are added while installation and for Ingress Resource for SSL Passthrough.