Capitals can draw attention to a certain part of the title, so if there is some dramatic you want to draw extra attention to, then capitals may be appropriate.
Using them for the whole title though defeats the point.
For example, if you were a gaming channel, showcasing Project 1845 which is an immensely large map with an entire 1:1 replica of the city of Beijing from the year 1750, a long with a bunch of other cool stuff - the map is really crazy huge.
So a title containing
"This city is gigantic!"
...doesn't really capture it as much as:
"This city is GIGANTIC!"
But if you then went as far as to put:
"THIS CITY IS GIGANTIC!"
...It's now over the top and just looks annoying in my opinion. The second option the caps emphasise just how big the city really is - but the third there's no emphasis.