Set up API spec and basic components

frontend/src/components/Video/Video.module.scss

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+.videoWrapper {
+  margin: 0 auto;
+  position: relative;
+  padding-bottom: 56.4%;
+  width: 100%;
+
+  iframe {
+    position: absolute;
+    width: 100%;
+    height: 100%;
+    border-radius: 10px;
+  }
+}
+
+.preview {
+  display: block;
+  text-decoration: none;
+  position: relative;
+  width: 100%;
+  max-width: 400px;
+  margin: 0 auto;
+  transition: transform .15s;
+
+  &:hover, &:focus {
+    transform: translateY(-2px);
+  }
+  &:active {
+    transform: translateY(-1px);
+  }
+
+  img {
+    width: 100%;
+    display: block;
+    border-radius: 10px;
+    background-color: #CCC;
+  }
+  span {
+    color: #FFFFFF;
+    position: absolute;
+    top: 50%;
+    font-size: 1.5rem;
+    text-align: center;
+    width: 100%;
+    display: block;
+    transform: translateY(-50%);
+    text-shadow: 0 0 20px rgba(0,0,0,.8);
+    user-select: none;
+
+    &::before {
+      content: '';
+      display: block;
+      height: 2em;
+      width: 2em;
+      background: currentColor;
+      border-radius: 100%;
+      margin: 0 auto .4em;
+      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23F79E00' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-play'%3E%3Cpolygon points='5 3 19 12 5 21 5 3'%3E%3C/polygon%3E%3C/svg%3E");
+      background-position: center;
+      background-repeat: no-repeat;
+      background-size: 1em;
+      box-shadow: 0 0 20px 0 rgba(0,0,0,.3);
+    }
+  }
+}

frontend/src/components/Video/Video.tsx

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+'use client'
+
+import { useState } from 'react'
+
+import { useTranslation } from '/src/i18n/client'
+import video_thumb from '/src/res/video_thumb.jpg'
+
+import styles from './Video.module.scss'
+
+const Video = () => {
+  const { t } = useTranslation('common')
+  const [isPlaying, setIsPlaying] = useState(false)
+
+  return isPlaying ? (
+    <div className={styles.videoWrapper}>
+      <iframe
+        width="560"
+        height="315"
+        src="https://www.youtube.com/embed/yXGd4VXZzcY?modestbranding=1&rel=0&autoplay=1"
+        title={t<string>('video.title')}
+        frameBorder="0"
+        allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+        allowFullScreen
+      />
+    </div>
+  ) : (
+    <a
+      className={styles.preview}
+      href="https://www.youtube.com/watch?v=yXGd4VXZzcY"
+      target="_blank"
+      rel="nofollow noreferrer"
+      onClick={e => {
+        e.preventDefault()
+        setIsPlaying(true)
+      }}
+    >
+      <img src={video_thumb.src} alt={t<string>('video.button')} />
+      <span>{t('video.button')}</span>
+    </a>
+  )
+}
+
+export default Video