Filming video with your DSLR can be an easy and cost effective way to incorporate a different type of original content to your blog. Most photography-based DSLRs are equipped with a function capable of shooting professional level footage. (Hey, professionals use HD DLSRs all the time, like the Canon 5D Mark II, even when shooting commercials!)
While shooting moving image with your DSLR can be fairly easy, here are simple some tips to get better quality video.
Use a tripod. DSLRs are actually quite light compared to other video cameras, so having something to stabilize it is extremely helpful when trying to get a steady shot. Also, having your hands free makes adjusting the focus, etc. easier. If you don't have a tripod, you can find a flat surface to rest the camera on.
Don't zoom while you're recording, as it can be distracting and jarring to the audience. If you need to get a closer shot, it's better to pause recording and change positions, or change positions while recording if you're subject cannot pause. Zooming too much can also cause graininess in your image.
Test your audio before you begin recording. If you are planning on recording audio with your video, make sure you test the microphone, person, and environment before you begin. Some settings may have an echo, some people speak very softly, sometimes your microphone isn't plugged in properly — the possibilities are endless. Fixing a visual glitch is much easier than fixing an audio one — trust me on this one, it's better to be safe than sorry.
Check your lighting. How does it look through the lens? Like photography, be wary if spaces that are too dark or bright, shadows, etc. Again, using the camera's white balance and testing the settings out before your actual shoot.
Framing your subject. When filming a subject, it's possible you may be moving around. Be careful you aren't chopping off the top of someone's head or only framing your subject in the center. Think about how you want the end product to look ahead of time and apply it as the action is happening.