I think lots of people haven't realized that video clips like Loom are actually built into Slack. The button that looks like a video camera below the input text box does it.
It's not a full replacement, but it's the one you already have.
Anecdote: It's so well hidden or underpromoted that exactly 1 colleague has sent me a video recorded via Slack in its feature's existence. (employee count: mid 000's)
It's not a full replacement, but it's the one you already have.