Video Demonstrations for all Ros2 Tutorials

### Concept
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For all the tutorials we must have a **video** at the bottom of the page that show
*how you can perform the above tutorial*.

### Previous Experience
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I saw a lot of beginners show resistance to linux/terminal . I posted a video in ROS1 Noetic **Nodes tutorial** , People really **loved it** and even reached out to me to produce more .

### Process
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It would be great for starters to have a **video to follow** by utilizing contents of written tutorials + **some additional explanation** .

### Who will do it ?
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I can do it , I mean i will be really happy to give back to ROS2 for what good it has brought in to my career.
If any one would like to join in -> I will be great full .

The issue names no files, tutorial entry points, or test locations. Start by inventorying the ROS2 tutorials in this repository and identify how pages currently embed media; done means every tutorial has a video at the bottom that follows the written steps and adds explanation.

Written by the indexing model from the issue text.