A basic React Video tag. I wanted to use video.js inside something I was building, so this is more or less a 5-minute tag for handling it. ES6 syntax but you can extrapolate what you need. Handles dynamically loading video.js/css as necessary since I really loathe serving any swf/etc myself. Could be easily extended or made better, works for me …

example.js

import React from 'react';
import Video from './Video';

class MyGenericApp extends React.Component {
    render() {
        return <div>
            <Video src="my_video_url" poster="my_poster_url" />
        </div>;
    }
}

react-video.js

import $ from 'jquery';
import React from 'react';

export default class Video extends React.Component {
    static defaultProps = {
        poster: null,
        src: null,
        width: 640,
        height: 360,
        className: 'video-js vjs-default-skin vjs-big-play-centered',
        controls: true,
        autoplay: false,
        preload: 'auto',
    }

    componentDidMount() { this.checkIfVideoNeedsInstallation(); }
    componentDidUpdate() { this.checkIfVideoNeedsInstallation(); }

    checkIfVideoNeedsInstallation = () => {
        if(!this.props.src)
            return;
        
        if(typeof videojs === 'undefined') {
            $('<link/>', {rel: 'stylesheet', type: 'text/css', href: 'https://vjs.zencdn.net/4.12/video-js.css'}).appendTo('head');
            $.getScript('https://vjs.zencdn.net/4.12/video.js', this.loadVideo);
        } else {
            this.loadVideo();
        }
    }

    loadVideo = () => {
        if(this.video || !this.props.src)
            return;

        let node = React.findDOMNode(this.refs.videoplayer);
        if(!node)
            return;

        this.video = document.createElement('video');
        this.video.src = this.props.src;
        this.video.width = this.props.width;
        this.video.height = this.props.height;
        this.video.className = this.props.className;
        node.appendChild(this.video);
        videojs(this.video, this.props);
    }
    
    render() {
        return <div ref="videoplayer" />;
    }
}

@apurvgandhwani To answer question 1, you need to read the documentation of react. You don't call it explicitly. To answer question 3, that's just how HTML works. Video argument will create a video element and place it in this instance, calling the variable "video".