What media should be used instead of radio waves for constant video conferencing facility?

 Yes ! It is possible instead of radio waves, constant video conferencing facility is possible.

with the help of FOC (Fiber Optic Cable).

Today, fiber optic technology widely used to transmit high quality videos. Fiber optic cables are made up of thin optical fiber strands.

Fiber transmit data from one location to another location in form of light waves.

Optical fiber uses light signal for transmitting data.

Light wave is transmitted through the optical fiber by a principle called total internal reflection.