Here are the different sizes available for videos:
Custom Size
Video:
Full HD - 1920 : 1080
Facebook:
Facebook Photo Post - 1200 x 630
Facebook Video Post - 1280 x 720
Facebook Link image - 1200 x 630
Facebook Story - 1080 x 1920
Facebook Ad (Carousel) - 1080 x 1080
Facebook Ad Single Image - 1200 x 628
Facebook Catalog Image - 1080 x 1080
Facebook Cover Photo - 820 x 312
Instagram:
Instagram Post - 1080 x 1080
instagram Story - 1080 x 1920
Twitter:
Twitter Post - 1200 x 628
Twitter Promoted Post - 1200 x 675
LinkedIn:
LinkedIn Feed Post - 1200 x 628
LinkedIn Square Post - 1200 x 1200
Pinterest:
Pinterest Pins - 735 x 1102
pinterest Promoted Pins - 1000 x 1500
Google:
Google My Business Image - 720 x 720
Youtube:
Youtube Thumbnail - 1280 x 720
Youtube Channel Art - 2560 x 423
Open Graph Image:
Open Graph Image - 1200 x 630