Well I realize that we have a greater group here of Non Video Enthusiasts. So let me clear up a couple things I see stated here that are misunderstood.
The main reason you have seen video implemented in to DSLR's is because you can shoot superior video with them compared to many dedicated camcorders Why, because of the sensors!
Especially, FF sensors, and APS-C are also excellent with the same advantage. Most of your camcorders have either 1 or 3 sensors in them, with the biggest being 3/4" and many at 1/2". Your more expensive Camcorders have 3 sensors, one each for RGB, and even those sensors are never above 3/4".There are also many other features in them that are more dedicated to the Pro video market. Most camcorders suffer from shooting in Low light, because of the small sensors that many use, especially 1/2". When Canon put video in to there DSLRS, they ignited and created a huge market and demand for DSLR Video Cameras. The FF sensors are so much better in low light, even the very early Canon 5D MII. Since that camera they have improved the Low Light specs by at least 3 times better than the 5D MII.
So with a DSLR you get superior Low light video, Super fast Lens's F1.2, 1.4, 1.8 in prime glass, and even some zooms, Tokinas 11-16mm is a hugely popular lens in the DSLR world of video.
You all so get greater control over depth of field, a very desirable feature in cinematography, and you also get a major benefit in focus, and sharpness, due to the wide choice of many lens's and adapters. Then there is the cost, If you keep things simple, (Invest wisely) you can gain a far superior shot quality compared to many camcorders, hence, why we now have so many budding videographers, using DSLR's. Powered Zooms on camcorders is very different compared to a few powerd zoom Len's that we are seeing coming out for the DSLR's, because on a camcorder, once you know the subject, and set your shot, you zoom all the way in on your subject, focus, and then you can zoom in and out in the complete zoom range and be in focus, as long as your subject does not move in towards or beyond the original focus set point. It's called Par-focal.
With a DSLR lens you have to set focus and continue to set focus, (Pull-Focus) as you shoot. Of course this all depends on your camera movement, and your subjects movement.
There's no mistaking the difference between shooting video with a DSLR, it's work, and can be a real challenge. But, the rewards are pretty significant when you do.
I have been a stills shooter, mostly Landscape, for many years, Yes I'm an old fart, But I fell in love with shooting video on a DSLR, I love creating video landscapes, I have a video that I'm working on now that is a compilation of different river and stream shots that I will use to play back on my 60" TV when I have guest's over or just for my family's enjoyment. I have found that my stills experience has been so rewarding in learning to shoot good video.
There are so many more things to think about, very challenging. Now I still love shooting stills, capturing a special moment in time. For me It has been a challenge trying to find a DSLR that can give me great features and the latest tech to allow me to capture great images, and still print them at a decent size, Bigger than 11x14. And, still give me many of the Video features that I want.
So far my research has me really looking pretty hard at getting a Nikon D750, The specs look very nice, and I know that there is plenty of great glass available. This might just be the Camera that I have been looking for. I know there will always be better cameras coming, but I have been through a number of different sensors and cameras, so I think that I can settle in on this Nikon D750. I'm going to rent one next month and give it a trial.
In general, Nikon has been behind the times compared to Canon in the video specs of there DSLR's, but I think they are now getting it. They would be crazy not to, it's a low cost feature set to gain a larger market selling the same gear.
In closing let me say this, video is a lot of fun shooting on a DSLR I can capture a moment in time, and a sequence of moments in time. OH yeah, then there is the post world!