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Roslaunch cannot find launch file

I have installed uvc_camera package by running:

~/ros_catkin_ws/src $ git clone git:// 
~/ros_catkin_ws $ catkin_make_isolated --pkg camera_umd --install

Everything went fine, no errors. But when I'm trying to launch a launch file from this package it says it cannot find it:

~/ros_catkin_ws $ ls /dev/video*
/dev/video0  /dev/video1
~/ros_catkin_ws $ roslaunch uvc_camera stereo_node.launch
[stereo_node.launch] is neither a launch file in package [uvc_camera] nor is [uvc_camera] a launch file name

The stereo_node.launch is still in the src folder:

~/ros_catkin_ws $ sudo find / -name stereo_node.launch

Is it normal that after installation the .launch file is still in the /src folder? If no, then would this be an installation issue? If yes, then why roslaunch cannot find it?