Hi Jack,
Theoretically, yes. You simply need to add multiple shortcodes per line. For example…
[youtube]BvP4RIqSbiw[/youtube][youtube]RhFMIRuHAL4[/youtube]
However, whether this works depends on your theme – if it’s a responsive one, for instance, chances are the first video will be put at full width. Just make sure the dynamic option is the profile screen is switched off.
David.