generating monocular data-set from a camera

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I am implementing ORB_SLAM2 library for monocular camera. I am using ROS Lunar to process my own sequences. I want to ask that what is the best way to generate the data set from the given camera? I have implemented some of the data set like TUM, KITTI, EuROC, I want to create my own.... I can record the video from the USB camera and now want to create a dataset out of it to process using SLAM2

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there is also somewhat related question with the python scripts provided on the following link. I sont know the command to implement it.

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Update: Well, using bag files could be one possibility. I have already tried several other things.

I have problems running node from camera

see the following link section 7 Running Monocular Node

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when I run the following command I get a black window but no live camera. It also says waiting for images

rosrun ORB_SLAM2 Mono /home/ujjval/ORB_SLAM2/Vocabulary/ORBvoc.txt /home/ujjval/ORB_SLAM2/Examples/Monocular/TUM1.yaml

I also created a issue on github

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