Bharat,
In my humble opinion, a small digital camera will serve you best. A SD card can capture over 500 pictures, and AA batteries are available everywhere.
You don't need special equipment or software to edit your pictures, most computer come with the software already installed. Just don't show anyone the photos you cull out, while editing video is a profession itself. Photos can be on your desktop, in memory books and enlarged for your walls. Videos are more limited.
My best suggestion is to buy the camera now and take lots of practice pictures. With digital, it won't really cost you much of anything and a good camera is about $100 US$. My photo instructor in High School had us shoot a roll of film in our bath room, just to learn what makes a good picture. Go to your local library, take a class. Get comfortable with the camera. And learn what makes a good picture and what you like.
While I have lots of camera gear, the camera you have with you, is better than anything at home. The camera really doesn't matter. It's you and your eye.
My Nikon CoolPix, a compact point and shoot camera, fit in my front pocket and was with me everywhere I went while on the Camino.
As you can tell, my bias is toward pictures vs. video, but figure out what works best for you.
Buen Camino. Jerry