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How to add two usb 2.0 cameras with libuvc_camera driver?

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Hi! I am a student who is conducting a research. I am really appreciate your work on ROS development. But now I encountered some problems with making use of usb cameras on ROS. Below is the information about my question. **Names and versions of stacks:** I am using ROS kinetic with libuvc_camera **Platform:** Ubuntu16.04 **Problem:** I want to use two generic usb 2.0 cameras with libuvc_camera package. Currently, I just can use one camera and show video stream in display type of image (not display type of camera) in Rviz. My question is how to use two usb 2.0 cameras in ROS and show them in display type of camera. I am not sure whether I need to change code from driver or launch file. If it is necessary to change the code, could you give me some suggestion, please? I might leave out some important details that you want to know from me. Please let me know if you need any information from me. Thank you so much.

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