According to Comic Book Resource on March 30, YouTube footage of the "Avengers 2" filming in South Korea made its way to the internet. Someone even got a close up of what appears to be Chris Evans as the Captain America character doing some stunts on top of a moving truck.
The footage isn't official, but it does show the equipment and film crew in the vicinity. There also is some footage taken from above in an office building. So one can indeed get an eye-full of what's going on with "Avengers 2". Doesn't mean that footage will be used, however, its something nice to look at.
Joss Whedon even stated that he appreciates the ability to film in South Korea and the ability to bring the entertainment industry to the location. He also mentioned all the hard worked involved working on the project internationally.
“We love this movie, we love your city, and having the two of them together will show the cities of the world in a light that it hasn't been shown, certainly not in America,” Whedon told the city of Seoul last week. “For us to showcase it in the manner we’re going to, and to have all the exciting action as part of 'Avengers: Age of Ultron,' is a real privilege. I apologize for how hard it is to do. But in the end, it’s something special, so thank you".
Whedon's "Avengers: Age of Ulton" will appear in theaters come May 1, 2015.