How to Rotate the TV screen 90 degrees for a conference call?

Question

Video broadcast

Connecting iPad via HDMI to a TV for Skype or FaceTime conferencing. The result is a cropped picture, with black bars on the sides.

We want to flip the TV vertically so that the streaming video is in full screen. Tell me how can I do this? I went around all the specialists in the city, the city is small, there are no sensible ones. They can’t do it! But I know that this can be done. A simple example is screens in Sberbank (but it probably comes from computers) And we need an iPad or iPhone. So same as here:
https://www.youtube.com/watch?v=rh1NX9mWnUo