JSXGraph
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Video embedding
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<iframe 
    src="http://jsxgraph.org/share/iframe/video-embedding" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Video embedding" 
    allowfullscreen
></iframe>
This code has to 
<style>
   .JXGtext {
        background-color: rgba(255, 255, 255, 0.6);
        padding: 5px;
        border-radius: 5px;
    }
</style>

<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 1 / 1; width: 100%;" data-ar="1 / 1"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution ShareAlike 4.0 International License.
    https://creativecommons.org/licenses/by-sa/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    var board = JXG.JSXGraph.initBoard(BOARDID, {
        boundingbox: [-6, 4, 6, -4],
        axis: false,
        grid: false,
        showNavigation: false,
        showCopyright: false,
        zoom: {
            enabled: false,
            wheel: false
        },
        pan: {
            enabled: false,
            needTwoFingers: false
        }
    });;
    
    board.options.point.showInfobox = false;
    board.options.elements.highlight = false;
    
    var points = [],
        t0x = -2, t0y = 3.5,
        t1x = 0, t1y = 3.5,
        t2x = 2, t2y = 3.5;
    
    points.push(board.create('point', [-2, 3.5], {
        fixed: false,
        color: 'yellow',
        size: 6,
        name: '6 am'
    }));
    points.push(board.create('point', [0, 3.5], {
        fixed: false,
        color: 'yellow',
        size: 6,
        name: '12 pm'
    }));
    points.push(board.create('point', [2, 3.5], {
        fixed: false,
        color: 'yellow',
        size: 6,
        name: '6 pm'
    }));
    
    var fo = board.create('fo', [
        '<video width="100%" height="100%" src="https://benedu.net/moodle/aaimg/ajx_img/astro/tr/1vd.mp4" type="html5video" controls>',
        [-6, -4], // lower left corner
        [12, 8]   // width, height
    ], {
        layer: 0,
        fixed: true
    });
    
    var f = JXG.Math.Numerics.lagrangePolynomial(points);
    var graph = board.create('functiongraph', [f, -10, 10], {
        fixed: true,
        strokeWidth: 3,
        layer: 8
    });
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution ShareAlike 4.0 International License.
https://creativecommons.org/licenses/by-sa/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

var board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-6, 4, 6, -4],
    axis: false,
    grid: false,
    showNavigation: false,
    showCopyright: false,
    zoom: {
        enabled: false,
        wheel: false
    },
    pan: {
        enabled: false,
        needTwoFingers: false
    }
});;

board.options.point.showInfobox = false;
board.options.elements.highlight = false;

var points = [],
    t0x = -2, t0y = 3.5,
    t1x = 0, t1y = 3.5,
    t2x = 2, t2y = 3.5;

points.push(board.create('point', [-2, 3.5], {
    fixed: false,
    color: 'yellow',
    size: 6,
    name: '6 am'
}));
points.push(board.create('point', [0, 3.5], {
    fixed: false,
    color: 'yellow',
    size: 6,
    name: '12 pm'
}));
points.push(board.create('point', [2, 3.5], {
    fixed: false,
    color: 'yellow',
    size: 6,
    name: '6 pm'
}));

var fo = board.create('fo', [
    '<video width="100%" height="100%" src="https://benedu.net/moodle/aaimg/ajx_img/astro/tr/1vd.mp4" type="html5video" controls>',
    [-6, -4], // lower left corner
    [12, 8]   // width, height
], {
    layer: 0,
    fixed: true
});

var f = JXG.Math.Numerics.lagrangePolynomial(points);
var graph = board.create('functiongraph', [f, -10, 10], {
    fixed: true,
    strokeWidth: 3,
    layer: 8
});
Videos can be embedded as `foreignobject` and placed in an arbitrary layer. That means, objects can be placed "above" the video, too.
<style>
   .JXGtext {
        background-color: rgba(255, 255, 255, 0.6);
        padding: 5px;
        border-radius: 5px;
    }
</style>
// Define the id of your board in BOARDID

var board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-6, 4, 6, -4],
    axis: false,
    grid: false,
    showNavigation: false,
    showCopyright: false,
    zoom: {
        enabled: false,
        wheel: false
    },
    pan: {
        enabled: false,
        needTwoFingers: false
    }
});;

board.options.point.showInfobox = false;
board.options.elements.highlight = false;

var points = [],
    t0x = -2, t0y = 3.5,
    t1x = 0, t1y = 3.5,
    t2x = 2, t2y = 3.5;

points.push(board.create('point', [-2, 3.5], {
    fixed: false,
    color: 'yellow',
    size: 6,
    name: '6 am'
}));
points.push(board.create('point', [0, 3.5], {
    fixed: false,
    color: 'yellow',
    size: 6,
    name: '12 pm'
}));
points.push(board.create('point', [2, 3.5], {
    fixed: false,
    color: 'yellow',
    size: 6,
    name: '6 pm'
}));

var fo = board.create('fo', [
    '

license

This example is licensed under a Creative Commons Attribution ShareAlike 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology in the credits.