I am posting a short tutorial & samples that show 2 different ways for obtaining or capturing camera images.
Please view the guide, and if you have any questions please share them here.
By the way, and this is not in the document, the Cameras node in Euclid publishes images to the topic /camera/color/image_raw.
So you can use the rossub.py demo to hook into these captured images.
If you don't want to use ROS, you can install pyrealsense as described in the tutorial and use rospub.py without publishing the images.