Wide screen movies on DVD, blu ray or HD Cable or SAT can still have black bars. The reason? Not all wide screen formats are the same.
But before I get into that, get into your DVD player menu and make sure it's set to wide (16:9) not 4:3
Next here are the ratios, they are on the back of the box usually, they are also usually listed at Netflix and Amazon.
2.35:1 and 2:40:1 movies also called 'cinescope' will have black bars. I'd avoid zooming or any other such tricks to get rid of them, you are only going to chop off the left and right of the image.
1.78. 1.77 and 1.85:1 will fill up the screen.
Looking at my personal collection of DVD movies, it's about 50/50 for these two groups of ratios. So bottom line, the black bars are still normal in some cases. If your DVD player isn't set correctly, the black bars will be larger than they should be, and everyone will look fat and short, and circles will look more like ovals.
Full screen (4:3) movies will result in black bars on the left and right.