Broadcasting tricks with boards

[IceHockey19]

During the games I've seen this strange boards with video running on them. At first I thought that may be these boards are video screens (just like in soccer), but protected with some thick glass to avoid damage. Now I see that I was wrong. Look at this:

Here is Hanzal to Palat to Michalek, and he scores (view from broadcasting camera):

Pepsi on boards

Here is goal replay from refs camera from behind the goal:
Scotiabank, Visa, Bridgestone

And here is replay from center ice:

Scotiabank, Visa, Bridgestone

I know about blue-green screen effect, but this is something cooler. How can it be done on main camera with so many objects with different colors, replacing boards with video in real time, like background behind players and refs.

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[angrymnky]

Got this from a quick google search.

For now, the technology is too cumbersome to allow for that. Supponor’s system required the NHL to attach hardware to the TV cameras that would pick up an infrared signal from an invisible film placed over the boards. The film had to be tested to ensure it could withstand checks, and that the ad images were clean and sharp and didn’t blend with the image of the game play. To install the hardware in 31 NHL arenas would be cost prohibitive. However, the NHL is hoping a software solution may soon be developed to allow ad insertions to be done by a central team.

 

[IceHockey19]

Thanks for the link. An interesting article.